An employee works at the factory of Guangdong LiShun Yuan Intelligent Automation Co, a paper box packaging machinery in Dongguan, Guangdong province, China July 4, 2019. Picture taken July 4, 2019. REUTERS/Shu Zhang 

An employee works at the factory of Guangdong LiShun Yuan Intelligent Automation Co, a paper box packaging machinery in Dongguan, Guangdong province, China July 4, 2019. Picture taken July 4, 2019. REUTERS/Shu Zhang 

A part of a turbine is seen before the visit of German Chancellor Angela Merkel at Siemens plant in Goerlitz, Germany, July 15, 2019. REUTERS/Hannibal Hanschke 

Combines harvest wheat in a field near the village of Kamennobrodskaya in Stavropol region, Russia July 4, 2019. REUTERS/Eduard Korniyenko 

A grain trailer empties wheat into the pit at the Farmers Cooperative Exchange in Bessie, Oklahoma, U.S., June 12, 2019. REUTERS/Nick Oxford 

A grain trailer empties wheat into the pit at the Farmers Cooperative Exchange in Bessie, Oklahoma, U.S., June 12, 2019. REUTERS/Nick Oxford 

A worker attends to machinery at a smelter plant at Anglo America Platinum's Unki mine in Shurugwi, Zimbabwe, May 16, 2019. Picture taken May 16, 2019. REUTERS/Philimon Bulawayo 

A worker attends to machinery at a smelter plant at Anglo American Platinum's Unki mine in Shurugwi, Zimbabwe, May 16, 2019. REUTERS/Philimon Bulawayo 

A man watches a wheel of a Caterpillar excavator at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

A woman poses in a wheel of a Caterpillar 777G off highway truck at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

A man poses in a wheel of a Caterpillar excavator at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

People visit the Bell stand at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

Children play in a Caterpillar '986K wheel loader' at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

People visit the Caterpillar stand at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

People visit the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle TPX IMAGES OF THE DAY 

People visit the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

Jungheinrich logo is pictured at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

Ammann logo is pictured at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

Manitou logo is pictured at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

Caterpillar logo is pictured at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

Caterpillar logo is pictured at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

Caterpillar logo is pictured at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

People visit the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

People visit Liebherr's demonstration at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

German Economy Minister Peter Altmaier and Markus Soeder, Prime Minister of Bavaria, walk down the stairs from R9200 mining excavator of 'Liebherr' during the official opening tour of the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

Visitors watch Liebherr's demonstration at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

Visitors watch Liebherr's demonstration at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

Visitors watch a demonstration of R9200 mining excavator of 'Liebherr' during the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

Visitors watch Liebherr's demonstration at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

Visitors watch Liebherr's demonstration at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

People visit Liebherr's demonstration at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

People visit Ammann's stand at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

People visit Deere's stand at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

People visit Wirtgen's stand at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

People visit Bomag's stand at the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

People visit the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

People visit the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

German Economy Minister Peter Altmaier and Markus Soeder, Prime Minister of Bavaria, pose at a R9200 mining excavator of 'Liebherr' during the official opening tour of the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

German Economy Minister Peter Altmaier and Markus Soeder, Prime Minister of Bavaria, pose at a R9200 mining excavator of 'Liebherr' during the official opening tour of the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

German Economy Minister Peter Altmaier attends the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

German Economy Minister Peter Altmaier and Markus Soeder, Prime Minister of Bavaria, attend the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

German Economy Minister Peter Altmaier and Markus Soeder, Prime Minister of Bavaria, attend the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

German Economy Minister Peter Altmaier (C) and Markus Soeder, Prime Minister of Bavaria, attend the 'Bauma' Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, Construction Vehicles and Construction Equipment in Munich, Germany, April 8, 2019. REUTERS/Michaela Rehle 

Sugarcane is carried by machinery at a processing plant at Coopevictoria sugar mill in Grecia, Costa Rica January 25, 2019. REUTERS/Juan Carlos Ulate 

Israeli personnel and heavy machinery work next to the border with Lebanon, in the town of Metulla, northern Israel December 4, 2018. REUTERS/Ronen Zvulun 

A man visits heavy machinery at Bauma China, the International Trade Fair for Construction Machinery in Shanghai, China November 27, 2018. Picture taken November 27, 2018. REUTERS/Aly Song 

A man visits heavy machinery at Bauma China, the International Trade Fair for Construction Machinery in Shanghai, China November 27, 2018. Picture taken November 27, 2018. REUTERS/Aly Song 

Security guards stand in front of heavy machinery of Caterpillar at Bauma China, the International Trade Fair for Construction Machinery in Shanghai, China November 27, 2018. Picture taken November 27, 2018. REUTERS/Aly Song 

People visit heavy machinery at Bauma China, the International Trade Fair for Construction Machinery in Shanghai, China November 27, 2018. Picture taken November 27, 2018. REUTERS/Aly Song 

Heavy machinery of XCMG is seen at Bauma China, the International Trade Fair for Construction Machinery in Shanghai, China November 27, 2018. Picture taken November 27, 2018. REUTERS/Aly Song 

Heavy machinery of XCMG is seen at Bauma China, the International Trade Fair for Construction Machinery in Shanghai, China November 27, 2018. Picture taken November 27, 2018. REUTERS/Aly Song 

People visit heavy machinery of Volvo at Bauma China, the International Trade Fair for Construction Machinery in Shanghai, China November 27, 2018. Picture taken November 27, 2018. REUTERS/Aly Song 

Lu Chuan, president of XCMG Construction Machinery visits Bauma China, the International Trade Fair for Construction Machinery in Shanghai, China November 27, 2018. Picture taken November 27, 2018. REUTERS/Aly Song 

People visit heavy machinery of Volvo at Bauma China, the International Trade Fair for Construction Machinery in Shanghai, China November 27, 2018. Picture taken November 27, 2018. REUTERS/Aly Song 

Oil pumps are seen after sunset outside Vaudoy-en-Brie, near Paris, France November 14, 2018. REUTERS/Christian Hartmann 

Oil pumps are seen after sunset outside Vaudoy-en-Brie, near Paris, France November 14, 2018. REUTERS/Christian Hartmann 

Oil pumps are seen after sunset outside Vaudoy-en-Brie, near Paris, France November 14, 2018. REUTERS/Christian Hartmann 

Oil pumps are seen after sunset outside Vaudoy-en-Brie, near Paris, France November 14, 2018. REUTERS/Christian Hartmann 

A worker uses a grinder to give shape and shine to an iron plate as he makes a cooking utensil at a manufacturing unit in Kolkata, India, November 12, 2018. REUTERS/Rupak De Chowdhuri 

A burned out bulldozer destroyed by the Camp Fire is seen in Paradise, California, U.S. November 10, 2018. REUTERS/Stephen Lam