Title:
Manhole frame and cover
United States Patent 3289556


Inventors:
Russell, Clayton D.
Application Number:
US35964664A
Publication Date:
12/06/1966
Filing Date:
04/14/1964
Assignee:
PHOENIX IRON WORKS
Primary Class:
Other Classes:
49/276
International Classes:
E02D29/14
View Patent Images:
US Patent References:
1926595Manhole frame and cover1933-09-12
Foreign References:
FR59727E1954-07-16
CH120752A1927-06-01