Manhole step

Details Manhole step Manhole step

1987-09-29

1989-10-31

Word, A. Hugo

Building units and construction elements

Stair, ladder, scaffold, or similar support

Element or attachment

Patent

active

D03043762

REFERENCES:
patent: 109649 (1870-11-01), Neefus
patent: 4241543 (1980-12-01), Foscarini et al.

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