Double Acting Pump
Description:
Patent for a double action pump. "This invention relates to improvements in double-acting pumps; and its object is to provide a vertical double-acting pump in which provision is made for automatically exhausting the air from the upper portion of the piston-chamber" (line 11-16) illustration included.
Date:
June 23, 1903
Creator:
Hall, S. N.
Item Type:
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