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Knee-Pad.
Patent for knee pads that are "simple, inexpensive, and durable, and which is so constructed as to hold the knee of the user in an elevated position above the ground or other surface upon which the pad may be placed, thereby preventing the knee contacting with the ground or other surface and causing injury to the knee (lines 10-17).
Date:
December 29, 1897
Creator:
Rice, John T.
System:
The Portal to Texas History
Valve
Patent for a "blow-off valve" (line 16). Illustrations included
Date:
December 29, 1908
Creator:
Koch, Rudolph
System:
The Portal to Texas History