| Patents for Pratt & Whitney Co. |
Patents 226 -
240
of 260
      |
| Number | Date | Patentee | Title | Type |
| 1,540,899 | Jun. 09, 1925 | F. Müller | Combined Metal Cutting Machine | turret lathes |
| 1,543,242 | Jun. 23, 1925 | F.C. Allen | Milling machine | milling machines |
| 1,545,052 | Jul. 07, 1925 | W.E. Ingham | Lathe feeding mechanism | metal lathes |
| 1,545,074 | Jul. 07, 1925 | J.J. Thacher | Tailstock | automatic lathes |
| 1,547,514 | Jul. 28, 1925 | P.M. Mueller | Thread Testing Device | thread gages |
| 1,549,635 | Aug. 11, 1925 | P.F. Vokal | Thread Gauge | micrometers |
| 1,560,697 | Nov. 10, 1925 | C. Knowles | Dressing Attachment for Veritcal Surface Grinders | grinder dressers |
| 1,582,669 | Apr. 27, 1926 | H.E. Durkee | Screw Thread Cutting Means for Bench Lathes | screwcutting lathes |
| 1,586,186 | May 25, 1926 | A.W. Erdman | Milling Hob | milling machine cutters |
| 1,588,003 | Jun. 08, 1926 | B.H. Blood | Thread-hobbing machine | thread hobbing and thread milling machines |
| 1,594,393 | Aug. 03, 1926 | P.F. Vokal | Grinding Wheel Dressing Attachment | grinder dressers |
| 1,611,048 | Dec. 14, 1926 | C. Knowles | Back Rest for Cylindrical Grinders | cylindrical grinders |
| 1,616,136 | Feb. 01, 1927 | E.A. Moyer | Tailstock Clamp | metal lathe accessories and attachments |
| 1,626,953 | May 03, 1927 | F. Müller | Tool Post | lathe tool holders and tool posts |
| 1,632,600 | Jun. 14, 1927 | F.O. Hoagland | Internal Grinding Machine | internal grinders |
