Irvine Keers Hetherington

Follow

Person

St. Charles, IL, US

People

Patents Grantslast 30 patents

Information Patent Grant
Telephone line battery feed circuit
- Patent number 4,007,335
- Issue date Feb 8, 1977
- Bell Telephone Laboratories, Incorporated
- Irvine Keers Hetherington
- H04 - ELECTRIC COMMUNICATION TECHNIQUE