single-reel magnetic tape cartridge format (Q116699297)
standardized enclosure for a reel of magnetic tape that is wound out on an external take-up reel
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Current Data About single-reel magnetic tape cartridge format
(P18) Image Provided By https://upload.wikimedia.org/wikipedia/commons/c/c8/Grundig_Stenorette_SL_Cassette_30.jpg
(P2096) "Grundig Stenorette SL cartridge (bottom) and two ordinary reels of tape (top)" (language: en)

(P31) (Q16887380)
(P642)

(P279) (Q116693876)

(P973) https://obsoletemedia.org/audio/magnetic-tape/
(P407)

(P1889) (Q28600774)

other details
description standardized enclosure for a reel of magnetic tape that is wound out on an external take-up reel