Caterpillar D8 during drawbar test. Front three-quarter view of Caterpillar D8 crawler towing the Adams test car and four other load tractors. The test car is offset to the right side from the main load, which could not be transmitted through its chassis
Drawbar test: Cletrac crawler test 235, 1935. The tractor tows the first test car and 2 load tractor...
Caterpillar D4 diesel during belt test. Caterpillar D4 diesel crawler inside the old tractor test la...
"Getting ready to start drawbar test no. 403. Massey-Harris 22 RT." The Massey-Harris 22RT is towing...
D-8 Caterpillar being tested on the dirt track before 1956. Front view of Caterpillar crawler roundi...
Three-quarter view of Case International tractor during a drawbar test. The tractor is towing the ne...
A large Crawler Tractor during a Drawbar Test -It is probably a TD 24 towing the Adams Test Car with...
The John Deere MT tractor during the drawbar test, while towing the Adams test car and two load trac...
International crawler drawbar test on dirt track. Test 346 describes the gasoline model. Test 347 de...
Allis-Chalmers HD-19 during rated load drawbar test. Rear view of Allis-Chalmers HD-19 crawler round...
New Fordson Major diesel during drawbar test 500. Side view of Fordson Major Diesel tractor towing t...
Test 136, 1927, Shaw Du-All model T25 being tested. The Adams test car is being used during the draw...
"1948. 100 Max drawbar test no. 397. Allis-Chalmers HD-19." Side view of Allis-Chalmers HD-19 crawle...
"Official drawbar test no. 396. Allis-Chalmers HD 5B. 1948." Side view of Allis-Chalmers HD-5B crawl...
Drawbar test: Cletrac crawler test 235, 1935. The tractor tows the first test car and 2 load tractor...
Caterpillar D4 diesel during belt test. Caterpillar D4 diesel crawler inside the old tractor test la...
"Getting ready to start drawbar test no. 403. Massey-Harris 22 RT." The Massey-Harris 22RT is towing...
D-8 Caterpillar being tested on the dirt track before 1956. Front view of Caterpillar crawler roundi...
Three-quarter view of Case International tractor during a drawbar test. The tractor is towing the ne...
A large Crawler Tractor during a Drawbar Test -It is probably a TD 24 towing the Adams Test Car with...
The John Deere MT tractor during the drawbar test, while towing the Adams test car and two load trac...
International crawler drawbar test on dirt track. Test 346 describes the gasoline model. Test 347 de...
Allis-Chalmers HD-19 during rated load drawbar test. Rear view of Allis-Chalmers HD-19 crawler round...
New Fordson Major diesel during drawbar test 500. Side view of Fordson Major Diesel tractor towing t...
Test 136, 1927, Shaw Du-All model T25 being tested. The Adams test car is being used during the draw...
"1948. 100 Max drawbar test no. 397. Allis-Chalmers HD-19." Side view of Allis-Chalmers HD-19 crawle...
"Official drawbar test no. 396. Allis-Chalmers HD 5B. 1948." Side view of Allis-Chalmers HD-5B crawl...
Drawbar test: Cletrac crawler test 235, 1935. The tractor tows the first test car and 2 load tractor...
Caterpillar D4 diesel during belt test. Caterpillar D4 diesel crawler inside the old tractor test la...
"Getting ready to start drawbar test no. 403. Massey-Harris 22 RT." The Massey-Harris 22RT is towing...