Observation monitoring well manhole cover

Details Observation monitoring well manhole cover Observation monitoring well manhole cover

1988-03-01

1990-07-03

Word, A. Hugo

Building units and construction elements

Prefabricated unit

Underground service vault

Patent

active

D03090248

REFERENCES:
patent: 1282732 (1918-10-01), Brickford
Signs Giving Definite Instructions Publication, p. 45, Children col. Item #347.
Signs Giving Definite Instructions Publication, p. 41, Stop and Give Way col. Item #124.

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