HARTFORD SPECIAL, INC

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SIMSBURY, CT, US

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Patents Grantslast 30 patents

Information Patent Grant
Re-rolling attachment for thread rolling machine
- Patent number 4,252,009
- Issue date Feb 24, 1981
- Hartford Special, Inc.
- Edward G. Grohoski
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...