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| All Patents in class 248/231.41 | |||||
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| Number | Date | Patentee | Title | Type | |
| 457,781 | Aug. 18, 1891 | E.E. Josef | Pillow Sham Holder | ||
| 2,824,381 | Feb. 25, 1958 | R.J. Traupmann | Pre-Indicator of Pipe Positions and Bends | pipe and tube benders | |