- "Dralowid" Reporter Carbon-Microphone, 1927...
- A Group of 8 interesting Microphones, from 19...
- 1 Crystal and 5 Magnetic Microphones, after 1...
- Carbon Cross-Flow Microphone, c. 1938...
- Sennheiser MKH 805 Shotgun Microphone, c. 196...
- 1 Dynamic and 5 Carbon Microphones, c. 1927...
- 2 Hand-Held Carbon Microphones...