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GTK Duplicating Co.: Difference between revisions
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* Post-1986 tapes have a black screen test pattern with the 1000 Hz tone at the end.
* Pre-1998 tapes have the record tab intact, while post-1998 tapes omitted it.
* Numerous tapes are recorded over by
* Certain 1997-2005 tapes were duplicated on cassettes manufactured in Korea.
* All tapes have a printing with a letter with the nominal tape length, mostly above the tab part. Examples M-15, A-30, H-45, W-15, T-30, K-45, etc.
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