Groetschel; Karl M.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Groetschel; Karl M..The latest application filed is for "fastening means for roof mats for mine workings".
- Groetschel; Karl M. - D-8000 Munchen DE
- Groetschel; Karl M. - D-8000 Munich 19 DE
- Groetschel; Karl M. - 8 Munchen 40 DE
| Patent | Date |
|---|---|
| Fastening means for roof mats for mine workings Grant 4,251,168 - Groetschel February 17, 1 | 1981-02-17 |
| Method of and apparatus for preselecting operation of television or radio receiving and recording apparatus Grant 4,222,069 - Groetschel September 9, 1 | 1980-09-09 |
| Methods of and apparatus for applying roof mats to mine workings Grant 4,122,682 - Groetschel October 31, 1 | 1978-10-31 |
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