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| Patents for National Machine Tool Co. (Racine) | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,647,622 | Nov. 01, 1927 | R. Heinrich, P. Kramer | Metal shears | |
 | 1,831,447 | Nov. 10, 1931 | R. Heinrich | Metal cutting instrument | |
 | 1,971,069 | Aug. 21, 1934 | R. Heinrich | Vise for shapers | |