having discharge tubes

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Patents Grantslast 30 patents

Information Patent Grant
High fidelity, professional grade microphone system for direct coup...
- Patent number 10,412,477
- Issue date Sep 10, 2019
- Wade Goeke
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
2058565
- Patent number 2,058,565
- Issue date Oct 27, 1936
- H03 - BASIC ELECTRONIC CIRCUITRY