Allis Chalmers 1 Avery 1 Buick 32 Cadillac 29 Case 1 Caterpillar 1 Chevrolet 54 Chrysler 30 Cletrac 1 CO-OP 1 Crosley 2 DeSoto 31 Diamond T 1 Dodge 52 Eagle 1 Farmall 1 Federal 1 Ford 60 Ford Tractor 13 Fordson 1 GMC 18 Harley-Davidson 2 Huber 1 Hudson 15 International 3 John Deere 1 Kenworth 1 Lincoln 20 Love 1 Massey-Harris 1 McKormick-Deering 1 Mercury 26 Minneapolis Moline 1 Nash 18 Oldsmobile 34 Oliver 1 Packard 20 Plymouth 37 Pontiac 31 Silver King 1 Studebaker 25 Willys 20 Reo 1