| Patents Granted on 1939-05-09 |
Patents 1 -
10
of 10
      |
| Number | Date | Patentee | Title | Type |
| 2,157,191 | May 09, 1939 | J.B. Sinnett | Method of and means for cooling motors | motor cooling |
| 2,157,417 | May 09, 1939 | R.F. Kneisley | Automatic circuit selector | woodworking machine mechanisms |
| 2,157,444 | May 09, 1939 | C.P. Whitlock | Tool Holder for Pneumatic Hammers | tool holders |
| 2,157,480 | May 09, 1939 | L.A. Cole | Magnetic valve | pump valves |
| 2,157,758 | May 09, 1939 | R.S. Jacobsen | Change Speed Transmission | |
| 2,157,760 | May 09, 1939 | W.E. Kane | Straightening machine | metal bending machines |
| 2,157,762 | May 09, 1939 | W.R. Knox | Machine tool | drilling and boring |
| 2,157,946 | May 09, 1939 | R.D. Wortendyke | Infeed Cycle Control Mechanism for Grinding Machines | grinding machines |
| 2,157,948 | May 09, 1939 | H.H. Beeny | Hardening of Metal Surfaces | flame hardening machines |
| 2,158,024 | May 09, 1939 | A.L. Stowell | Coilable measuring rule | tape measures |
