Underground conduit

Details Underground conduit Underground conduit

1983-12-05

1986-08-19

Word, A. Hugo

Equipment for production, distribution, or transformation of ene

Energy conversion or transformation

D25 74

Patent

active

D02851920

REFERENCES:
patent: D175586 (1955-09-01), Cataldo
patent: 220765 (1879-10-01), Linford
patent: 3004330 (1961-10-01), Wilkins
patent: 4137424 (1979-01-01), Hesse et al.
patent: 4454692 (1984-06-01), Ault
patent: 4479687 (1984-10-01), Humphreys et al.
Sunlight Plastics Extrusions brochure, Item A, p. 1.

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