In a 1960 edition of BTL, the human factors work that was used to determine the ordering and positioning of touch tone buttons was detailed:
https://www.vcalc.net/Documents/touchtone_hf.pdf
Lauren Weinstein
npub1lq…knf7e
2025-03-03 22:00:22 UTC
in reply to nevent1q…0680
Author Public Key
npub1lq68asmanu3etxax9hvrj8au4h585lq8zgzujmufqsewtsz85mkskknf7ePublished at
2025-03-03 22:00:22 UTCEvent JSON
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