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| Patents Granted on 1981-04-14 | |||||
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| Number | Date | Patentee | Title | Type | |
| 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 | |