USD252950SExpiredUtility

Lightweight trench box

20
Assignee: AGL CORPPriority: Aug 29, 1977Filed: Aug 29, 1977Granted: Sep 18, 1979
Est. expiryAug 29, 1997(expired)· nominal 20-yr term from priority
Inventors:William F. Birchfield
20
PatentIndex Score
1
Cited by
4
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a lightweight trench box, as shown.

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