| Patents Granted on 1928-05-?? |
Patents 1 -
15
of 50
      |
| Number | Date | Patentee | Title | Type |
| 1,667,801 | May 01, 1928 | A.L. Christensen, C.E. Hawkes | Combination Tool Holder | lathe tool holders and tool posts |
| 1,667,809 | May 01, 1928 | F.A. Kershaw | Internal Gauge | special purpose gauges |
| 1,668,245 | May 01, 1928 | H.A. McGowan | Crank Case Implement | automotive specialty wrenches |
| 1,668,248 | May 01, 1928 | R.W. Olson | Micrometer Attachment | micrometers |
| 1,668,361 | May 01, 1928 | H.B. Foley | Saw-filing machine | woodworking machine sharpening mechanisms |
| 1,668,512 | May 01, 1928 | A.W. Miller | Device for Dressing Locomotive Wheels | portable turning tools |
| 1,668,633 | May 08, 1928 | J.I. Depew | Plowshare and Cultivator Shovel Straightener | shovels |
| 1,668,645 | May 08, 1928 | A. Hormel | Window-cleaning device | |
| 1,668,647 | May 08, 1928 | A.M. Johnson | Feed mechanism for drilling machines | drill presses |
| 1,668,746 | May 08, 1928 | A. Turner | Roll-Grinding Machine | grinding machines |
| 1,668,927 | May 08, 1928 | J. Stumpf | Noncondensing steam engine | steam engines |
| 1,669,006 | May 08, 1928 | H.L. Johnston | Clutch mechanism | industrial machine clutches |
| 1,669,134 | May 08, 1928 | N.T. Kelso | Molded commutator | electric motor making |
| 1,669,137 | May 08, 1928 | A.J. Libert | Tool Holder | lathe tool holders and tool posts |
| 1,669,194 | May 08, 1928 | A.F. Froussard | Portable Milling Machine | milling machines |
