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| All Patents in class 407/92 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,541,719 | Feb. 13, 1951 | J.R. Proksa | Machine Tool Bit Holder | metalworking machine tool holders | |
| 2,587,179 | Feb. 26, 1952 | A.J. Leveille | Tool Holder | lathe tool holders and tool posts | |
| 2,825,959 | Mar. 11, 1958 | W. Bader | Tool Holder | insert tool holders | |
| 2,912,744 | Nov. 17, 1959 | J.R. Proksa | Tool Bit Holder | insert tool holders | |
| 2,964,833 | Dec. 20, 1960 | R.E. Novkov | Cutoff Tool and Holder Therefor | lathe tool holders and tool posts | |