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Today in WW II: 13 Jul 1941 British-USSR mutual aid pact signed.  More 
13 Jul 1943 Battle of Kolombangara in the Solomon Islands; US Navy prevents Japanese from landing reinforcements on New Georgia, although Japanese ships escaped and US had 3 seriously damaged.
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International Harvester TD-40 Tractor / Bulldozer

The International Harvester TD-40 Tractor / Bulldozer was produced from 1933 through 1939, the first IH diesel. They were procured by the U.S. Army in small numbers and were used through WW II. The vehicle was called the McCormick Deering TD-40 TracTracTor.

International Harvester TD-40 Characteristics

Weight 12,400 lbs (5624 kg)
Length 140 inches (355 cm)
Width 64 inches (162 cm)
Engine IH 4 cyl diesel
Drawbar HP 37
Belt HP 48
Transmission 5 fwd / 1 rev

International TD-40 bulldozer knocking down trees, cutting a roadway for the Alcan Highway, 1942.  Air cleaner tube on side of engine goes through the cover, one characteristic of the TD-40.  Using the Bucyrus-Erie blade that was supplied for the TD-40
International TD-40 bulldozer knocking down trees, cutting a roadway for the Alcan Highway, 1942. Stack tube on side of engine goes through the cover, one characteristic of the TD-40. Using the Bucyrus-Erie blade that was supplied for the TD-40.