Number | Name | Date | Kind |
---|---|---|---|
D. 139444 | Lippincott | Nov 1944 | |
D. 405210 | Elgeston | Feb 1999 | |
5535110 | Ling | Jul 1996 | |
5993028 | Ong | Nov 1999 |
Entry |
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Harrington & King Perforating Co. Inc., May 1961, p. 108, rectangular slots.* |
Harrington & King Perforating Co. Inc., May 1961, p. 118, triangular and round openings. |