| Patents Granted on 1981-04-?? |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 4,259,815 | Apr. 07, 1981 | W.G. Kuban | Blade sharpener | sharpening apparatus |
| 4,261,233 | Apr. 14, 1981 | J.W. Konecay | Ratchet Wrench of the Socket Drive Type | ratchet wrenches |
| 4,261,234 | Apr. 14, 1981 | H. Berbalk | Lathe for Machining a Crankshaft | crankshaft lathes |
| 4,261,675 | Apr. 14, 1981 | F. Zankl | Machine Tool With Pulsating Cutting Force | milling machines |
| 4,262,455 | Apr. 21, 1981 | R. Rettew | Head Positioning for a Belt Grinder | surface grinders |
| 4,262,527 | Apr. 21, 1981 | J.A. Thompson, D.D. Grover | Self-Adjusting Engine Timing Pickup Probe | |
