U.S. Pat. No. 984,969
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A 3D Model Of U.S. Pat. No. 984,969 -- Cutting Edge 1910 Screw Technology! "To All Whom It May Concern: Be It Known That I, Henry G. Reiniger, A Citizen Of The United States, Residing At Rathdrum, In The County Of Kootenai And State Of Idaho, Have Invented A Certain New And Useful Improvements In Screws, Of Which The Following Is A Specification."
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