Minifon portable wire recorder: route of wire around recorder - Playback and recording equipment - Radio and sound recording history | British Library - Sounds
Cold War Espionage & the 1950s Minifon Wire Recorder - historictech
Protona. An unusual Minifon pocket size magnetic wire recorder and chromed wrist microphone, resembling a chronograph wristwatch by Hanhart
FOUND: a Proper SPY-TOOL For The Big Kids That We Really Are - Monochrome Watches
Minifon portable wire recorder: overview showing spools - Playback and recording equipment - Radio and sound recording history | British Library - Sounds