Improvement in Rotary Subsoil-Plows. (open access)

Improvement in Rotary Subsoil-Plows.

Patent for an improvement upon subsoil plows, using a series of spades arranged upon the same pulleyed rotary shaft, combined with furrow-opening plows.
Date: March 28, 1871
Creator: Morris, Joseph R.
System: The Portal to Texas History