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| Patents Granted on 1991-04-30 | |||||
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| Number | Date | Patentee | Title | Type | |
| D316,512 | Apr. 30, 1991 | R.T. Pistorius | Connector for picture frames or the like | ||
| 5,011,324 | Apr. 30, 1991 | G.A. Putney | Detent Structure Having a Retaining Lip with a Smooth Continuous Outer Surface Free from Stress-Concentrating Corners | ||