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Improvement in Double-Acting Force-Pumps.
Patent for a double-acting force pump that has "single cylinder and hollow piston-rod operate in connection with the upper and lower cylinder-valves, and with a valved piston adapted to have a reciprocal motion independent of and upon the hollow piston-rod, to discharge the water from both sides of the piston with a double action and in a continuous stream through said hollow piston-rod" (para. 2).
Date:
September 16, 1879
Creator:
Newman, Charles Elijah
System:
The Portal to Texas History