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| All Patents in class D12/131 | |||||
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| Number | Date | Patentee | Title | Type | |
| D413,554 | Sep. 07, 1999 | P.E. Schlangen | Powered wheelchair | ||
| D431,502 | Oct. 03, 2000 | P.E. Schlangen | Wheelchair with vertically adjustable seat | ||
| D445,726 | Jul. 31, 2001 | P.E. Schlangen | Combined wheelchair arm rest and compartment | ||
| D473,826 | Apr. 29, 2003 | P.E. Schlangen, P.R. Lawson, W.L. Eshleman | Modular person transport chair | ||