The broken lines shown in the figures are for the purpose of illustrating portions of the staircase obstacle assembly and form no part of the claimed design.
The broken lines shown in the figures are for the purpose of illustrating portions of the staircase obstacle assembly and form no part of the claimed design.
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3175654 | Calvert | Mar 1965 | A |
3670848 | Raiguel, Jr. | Jun 1972 | A |
4042064 | Lobb | Aug 1977 | A |
4580777 | Johnson | Apr 1986 | A |
5833576 | Henmi | Nov 1998 | A |
6085867 | Daniel, III | Jul 2000 | A |
D838384 | Monnin | Jan 2019 | S |