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| Patents for Guardian Trust Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,797,986 | Mar. 24, 1931 | F.C. King | Tool Holder | ||
| 1,910,296 | May 23, 1933 | F.C. King | Punch Retainer Mechanism | ||
| 1,939,503 | Dec. 12, 1933 | F.C. King | Tool Holder | ||