Gerald R. Crawford

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Sergeant Bluff, IA, US

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Patents Grantslast 30 patents

Information Patent Grant
Packerhead assembly
- Patent number 5,080,571
- Issue date Jan 14, 1992
- International Pipe Machinery Corporation
- Gerald R. Crawford
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Method and apparatus for production of concrete pipe by the packerh...
- Patent number 4,540,539
- Issue date Sep 10, 1985
- International Pipe Machinery Corp.
- Gerald R. Crawford
- B28 - WORKING CEMENT, CLAY, OR STONE