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Colter.
Patent for the instructions on of how to construct a Colter including illustrations.
Date:
April 25, 1916
Creator:
James Zedrick Elder
System:
The Portal to Texas History
Improvement in Devices for Teaching Musical Transposition.
Patent for an improvement in devices for teaching musical transposition. The invention in question is composed of a keyboard "with sliding instruments and scales" (1).
Date:
April 25, 1876
Creator:
Allison, Thomas J.
System:
The Portal to Texas History