Grado headphones official, not so official paperwork and boxes
Sheets that were being distributed at Grado Labs in the days.
As well as in Joseph Grado Signature Product Labs, because these were separate buildings and companies.
Stereophile, May 1991 issue Grado HP 1 review there: http://www.head-fi.org/t/616052/full-grado-labs-history/45#post_8875805
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