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| Patents Granted on 1967-02-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,304,771 | Feb. 21, 1967 | P. Ochs | Torque Wrench | torque wrenches | |
| 3,304,811 | Feb. 21, 1967 | R.H. De Witt | Hand saw grinder | saw sharpening machines | |
| 3,304,817 | Feb. 21, 1967 | J.E. Swanstrom, Jr., S.E. Swanson | Wrench with Concave Jaw Teeth | chain and strap wrenches | |
| 3,305,094 | Feb. 21, 1967 | K.H. Casson | Vacuum filter | ||
| 3,305,762 | Feb. 21, 1967 | C.E. Geib, Jr. | Method of control of electric power | motor controls | |