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| All Patents in class 91/189R | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,141,385 | Jul. 21, 1964 | H.R. Uhtenwoldt | Precision Indexing Mechanism for Machine Tools | indexers and dividers | |
| 3,242,823 | Mar. 29, 1966 | L.A. Dever, R.L. Sears | Fail Safe Clamping Mechanism for a Machine Tool | broaching machines | |