Allis Chalmers 1 Avery 1 Buick 32 Cadillac 29 Case 1 Caterpillar 1 Chevrolet 51 Chrysler 29 Cletrac 1 CO-OP 1 Crosley 2 DeSoto 31 Diamond T 1 Dodge 49 Eagle 1 Farmall 1 Federal 1 Ford 51 Ford Tractor 14 Fordson 1 GMC 17 Harley-Davidson 2 Huber 1 Hudson 15 International 3 John Deere 1 Kenworth 1 Lincoln 21 Love 1 Massey-Harris 1 McKormick-Deering 1 Mercury 27 Minneapolis Moline 1 Nash 17 Oldsmobile 32 Oliver 1 Packard 18 Plymouth 37 Pontiac 30 Silver King 1 Studebaker 25 Willys 19 Reo 1