Newspaper article at the introduction of the SD-4.

R. H. Sheppard being interviewed by the local radio station at the introduction of the SD-4.

The star of the introduction.

R. H. Sheppard drives the first SD-4 tractor off of the assembly line.

Dealers and press at the introduction of the SD-4.

R. H. Sheppard test plowing with SD-4 tractor.

SD-4 tractor at the Pennsylvania State Farm Show.

SD-4 wide-front tractor.

SD-4 power train.

SD-4 wide-front tractor with plow.

SD-4 steering linkage.

SD-4 wide-front tractor with cultivator.

SD-4 tractor with Fodor chopper.

SD-4 tractor planting with grain drill.

SD-4 wide-front tractor with chisel plow.

SD-4 wide-front tractor.