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| Patents Granted on 1981-04-?? | |||||
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| Number | Title | Classification(s) | |||
| 4,259,815 | Blade sharpener | 451/552, 451/557, 76/86 | |||
| 4,261,233 | Ratchet Wrench of the Socket Drive Type | 192/43.1, 81/62 | |||
| 4,261,234 | Lathe for Machining a Crankshaft | 82/106 | |||
| 4,261,675 | Machine Tool With Pulsating Cutting Force | 409/141, 409/156, 409/196 | |||
| 4,262,455 | Head Positioning for a Belt Grinder | 451/24, 451/304, 451/305, 451/311 | |||
| 4,262,527 | Self-Adjusting Engine Timing Pickup Probe | 324/392, 73/116 | |||