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| Patents Granted on 1971-07-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,593,466 | Jul. 20, 1971 | R.M. Bell | Abrasive-compound-applicating means | ||
| 3,594,460 | Jul. 20, 1971 | M.A. Schwartz, H.L. Rechter | Method for preparing a laboratory counter top | ||
| 3,594,783 | Jul. 20, 1971 | T.B. Bullock | Apparatus for Numerical Signaling of Positions, Including Digital to Analog Converter | nc and cnc apparatus | |