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Electric-Current Relay
Patent for Electric-Current Relay to allow capability of use with either a direct or alternating current. This is adapted for economical use in constant temperature apparatus. Further, this technology avoids the possibility of "sticking of relay movable contacts".
Date:
July 19, 1921
Creator:
Lorenz, Charles O.
System:
The Portal to Texas History
Motorcycle-Stand.
Patent for a motorcycle stand that can be released manually through a lever near the saddle to lock the stand into place until the operator unlocks it.
Date:
July 21, 1921
Creator:
Swenson, Carl J.
System:
The Portal to Texas History
Self-Lining Interlocking Building-Block.
Patent for interlocking building-blocks that allow for the formation of strong insulated and properly lined walls without the use of skilled labor and with or without reinforcements.
Date:
July 12, 1921
Creator:
Merren, John Jay
System:
The Portal to Texas History
Valve.
Patent for improvements to valves, specifically valves that have a sliding movement on the valve seat and to disk valves. The invention is to provide a valve of this type which is used in the interior of vats, tanks, or similar receptacles containing liquids.
Date:
July 5, 1921
Creator:
Spencer, Elmer H. & Block, A.C.
System:
The Portal to Texas History