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Clem Conical Pump - KeelyNet 03/01/03

Patent 3,697,190 "Truncated Conical Drag Pump". The patent was issued October 10, 1972 (criteria 1) and appears to match the description of the asphalt pump that Clem converted into his motor.
Clem Conical Pump - KeelyNet 03/01/03Patent
number: 3697190 Filing date: Nov 3, 1970 Issue date: Oct 1972 Inventor: Walter D. Haentjens
TRUNCATED CONICAL DRAG PUMP - Google Patents

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