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| All Patents in class 296/20 | |||||
| Number | Date | Patentee | Title | Type | |
| 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 | ||