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| Patents for Robert H. Clark | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,385,902 | Oct. 02, 1945 | H.C. Wilson | Fixture for grinding thread-cutting tools | grinding fixtures | |
| 2,405,686 | Aug. 13, 1946 | R.H. Clark | Machine Tool | turret lathes | |
| 2,528,299 | Oct. 31, 1950 | R.H. Clark | Machine Tool | turret lathes | |