STC microphone type 4021A
- Made:
- 1930-1950
STC microphone type 4021A (known as apple and biscuit) No. 20751.
Known as 'apple and biscuit' due to its usual shape with a spherical base and flat 'biscuit' top.
Details
- Category:
- Radio Communication
- Object Number:
- 1960-128
- Materials:
- metal (unknown)
- type:
- microphone
- credit:
- British Broadcasting Corporation