| Patents for H. A. Chapin |
Patents 16 -
30
of 36
      |
| Number | Date | Patentee | Title | Type |
| 394,422 | Dec. 11, 1888 | D.B. Wesson | Process of forming dovetail slots in wood | dovetailing machines |
| 394,423 | Dec. 11, 1888 | D.B. Wesson | Process of forming dovetails in wood | dovetailing machines |
| 429,961 | Jun. 10, 1890 | J.A. Robbins | Watch makers bow bender | watchmaker |
| 432,180 | Jul. 15, 1890 | L.L. Davis | Bit-stock | brace chucks |
| 435,348 | Aug. 26, 1890 | J.L. Murphy | Metal Butt Gage | marking gauges |
| 449,410 | Mar. 31, 1891 | H. Hammond | Improvements in Pipe and Other Wrenches | pipe wrenches |
| 501,860 | Jul. 18, 1893 | W.S. Bemis | Combined Pipe and Monkey Wrench | pipe and nut combination wrenches |
| 515,988 | Mar. 06, 1894 | C.H. Baush | Drilling-machine | radial drill presses |
| 515,989 | Mar. 06, 1894 | C.H. Baush | Drilling-machine | radial drill presses |
| 521,346 | Jun. 12, 1894 | A. Premo | Anti-vibratory pressure-bar for woodworking machinery | wood planers |
| 521,430 | Jun. 12, 1894 | A.A. Bourgeous | Boring-bit | drill bits |
| 565,413 | Aug. 04, 1896 | C.L. Pepper | Implement For Repairing Pneumatic Tires | pliers |
| 570,723 | Nov. 03, 1896 | C.E. Van Norman | Milling Machine | milling machines |
| 576,074 | Jan. 26, 1897 | M.J. Owens, H.J. Colburn | Glass-blowing machine | |
| 578,588 | Mar. 09, 1897 | C.E. Van Norman | Milling-machine | milling machines |
