| Accession Number | 100159 |
|---|---|
| Collection type | Photograph |
| Object type | Negative |
| Conflict |
Period 1930-1939 |
| Copyright |
Item copyright: Copyright expired - public domain
|
c. 1937. A circuit diagram of a special series noiseless recording amplifier.
Description
c. 1937. A circuit diagram of a special series noiseless recording amplifier.