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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(P18) Image Provided By https://upload.wikimedia.org/wikipedia/commons/c/c8/Grundig_Stenorette_SL_Cassette_30.jpg
(P31) (Q16887380)
(P279) (Q116693876)
(P973) https://obsoletemedia.org/audio/magnetic-tape/
(P1889) (Q28600774)
other details
description standardized enclosure for a reel of magnetic tape that is wound out on an external take-up reel