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| All Patents in class 254/235 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 143,604 | Oct. 14, 1873 | E. Ainsworth | Belt Clamps | |
| 351,514 | Oct. 26, 1886 | J.W. Johnson | Belt Clamp | ||
| 5,611,521 | Mar. 18, 1997 | F.W. Randle, D.D. Grover | Power Drive for Cable Tightener | ||
| 5,911,409 | Jun. 15, 1999 | D.D. Grover | Barge Ratchet Driver with Reaction Bars | ||