Patents for J. P. Hall


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Patents for J. P. Hall
Patents 1 - 6 of 6
Number	Title	Classification(s)
45,535	Parallel Rule with Protractor	33/431
48,857	Improvement in sawing machines	83/416
49,139	Improved Lathe for Turning Heads of Nail, Tacks, etc.	470/53, 82/117
50,759	Improvement in rotary steam-engines	418/34, 418/38
51,522	Improvement in pumps	137/512, 417/565
146,123	Bit-stock	279/36