Title:
Concrete pipe construction
United States Patent 3228425
Inventors:
Michael, Pacella
Publication Date:
01/11/1966
Export Citation:
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Assignee:
Michael, Pacella
Primary Class:
138/176
Other Classes:
285/293.1
International Classes:
F16L13/11; F16L25/00; F16L13/00; F16L25/00
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US Patent References:
2805683Pipe and method for making the same
2576012Sleeve joint for concrete tubes
2325469Piping element
2138946Method for sealing pipe joints
1048045N/A
0922480N/A