Portable half-step stairway unit

Details Portable half-step stairway unit Portable half-step stairway unit

1983-09-21

1986-12-16

Word, A. Hugo

Building units and construction elements

Stair, ladder, scaffold, or similar support

Element or attachment

D25 65, 182228

Patent

active

D02872838

REFERENCES:
patent: D150031 (1948-06-01), Richards
patent: 567985 (1896-09-01), Clair
patent: 2044260 (1936-06-01), Schiele
patent: 2730412 (1956-01-01), Yoder
patent: 3381775 (1968-05-01), Livers
patent: 4113161 (1978-09-01), Manuszak

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