chisel plow, 32
clamshell, 49, 84
coal digger, 81
coal loaders, 81
coal mining, 9, 78-83
corn cutter, 25
corn picking machine, 21
corn planter, 19
cotton picker, 37-38
cotton planter, 37
crane, 10, 49-52, 54, 85
crawler tractor, 45
crawlers, 10, 48, 49
crowd shovel, 49
“cub” tractor, 44
cultivator, 21
cutter heads, 15
cutting head, 81
cyclone, 39
derrick, 69