Minifon portable wire recorder: close-up of take-up spool - Playback and recording equipment - Radio and sound recording history | British Library - Sounds
Minifon Portable
Minifon P55 Tape Recorder | Reel to Reel
Protona Minifon P-55
Protona Minifon P-55
Vintage Minifon Protona Mi-51 Spy Recorder and Microphone Wristwatch working | eBay
He's Wearing A Wire!" Minifon's Spy Watch Is Some Real 007 Stuff | TechCrunch
GERMAN MINIFON P55 MINIATURE STEEL WIRE RECORDER AND SPY WRISTWATCH WITH HIDDEN MICROPHONE