Blank Cassettes: Audio - Maxell - UD XL - C - 46 - Japan (1975)

Blank Cassettes: Audio - Maxell - UD II - C - 60 - Japan (1985)

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MAXELL UD C90 Lot Of 6 Pcs Cassette Tape 1975 Japan $30.55 - PicClick AU

Blank Cassettes: Audio - Maxell - UD XL I - C - 90 - USA (1977)

Music 1940-1979 Magazines in Japanese for sale

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Compact Cassette tape types and formulations - Wikipedia