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| Patents Granted on 1970-07-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,521,510 | Jul. 21, 1970 | T.F. Angquist | Spring Opened Pliers | pliers | |
| 3,521,524 | Jul. 21, 1970 | R.A. Wassdorp, E.J. Hunkeler | Control Apparatus for Checking and Controlling Sequential Machine Operations | machine tool controls | |
| 3,521,526 | Jul. 21, 1970 | S.E. Klabunde, E.A. Olig | Method and Apparatus for Positional Control Compensation for Temperature Changes in Machine Tool Spindles | metalworking machine mechanisms | |