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| Patents Granted on 1961-07-11 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,991,558 | Jul. 11, 1961 | P. Cherkas | Air Gage Cartridge | pneumatic measuring gauges | |
| 2,991,595 | Jul. 11, 1961 | W.A. Addis | Power operating belt sanding machine | handheld power sanders | |
| 2,991,666 | Jul. 11, 1961 | A.S. Charlat | Power-Transmitting Device for Machine Tools | ||
| 2,991,673 | Jul. 11, 1961 | A.F. van Rooij | Device for grooving superfinished steel shafts | metal lathe accessories and attachments | |