| Patents Granted on 1921-05-31 |
Patents 1 -
11
of 11
      |
| Number | Date | Patentee | Title | Type |
| RE15,115 | May 31, 1921 | E.D. Mackintosh | Method of driving electric centrifugal machines | |
| 1,379,755 | May 31, 1921 | C.W. Francis | Apparatus for making windings | electric motor making |
| 1,379,866 | May 31, 1921 | C.L. Hollingsworth | Adjustable Offset Tool Holder | metalworking machine tool holders |
| 1,379,878 | May 31, 1921 | L. Rouanet | Apparatus for Setting Gages | tool setting apparatus |
| 1,379,994 | May 31, 1921 | J.J. Kunzer | Method of Making Drills or the Like | making drills and augers |
| 1,379,995 | May 31, 1921 | J.J. Kunzer | Method of Making Drills or the Like | making drills and augers |
| 1,380,094 | May 31, 1921 | G.H. Clark | Safety Valve | steam safety valves |
| 1,380,139 | May 31, 1921 | W.A. Greaves | Tailstock | wood lathes |
| 1,380,187 | May 31, 1921 | C.H. Brose | Measurer and Gage | garment measuring tools |
| 1,380,317 | May 31, 1921 | O. Gustafson | Tool Holder | lathe tool holders and tool posts |
| 1,380,326 | May 31, 1921 | W.W. Stoler | Drop Hammer | drop hammers |
