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| Patents for Grönkvist Drill Chuck Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | GB-190,223,982 | Jun. 04, 1903 | L.A. Nilsson | Improvement in chucks | |
 | 848,566 | Mar. 26, 1907 | L.A. Nilsson | Boring-chuck | |