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| All Patents in class 188/1.12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,902,576 | Sep. 02, 1975 | R.W. Pitan, R.M. Biessener | Add-on unidirectional brake | dollies, carts and hand trucks | |
| 4,922,574 | May 08, 1990 | J.A. Parise, G.R. Slivon, C.H. Heiligenthal | Caster Locking Mechanism and Carriage | ||
| RE34,433 | Nov. 09, 1993 | J.A. Parise, G.R. Slivon, C.H. Heiligenthal | Caster Locking Mechanism and Carriage | ||