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According to PPC Journal V6 N4 Page 6 July 1979 column one paragraph two, its July 16th 1979.
IIRC, this has been discussed in the past, and I do not recall if the matter was truly settled.
A random selection of late 70s'/early 80s' entries on Craig's site has the first of the month used as the introduction date. I speculate that it is an estimate. IMHO, PPC Journal has more street cred.
Edited: 1 July 2009, 2:39 p.m.
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Quote:
Wasn't the HP-41C announced on July 16, 1979?
Hi,
July 16th is correct. I remember it like it was yesterday and I couldn't get a machine until 7/31....it was a frustrating two weeks' wait. Here is a copy of the HP press release, as published in the PPC Journal, Volume 6, Number 4, page 8:
[link:http://www.pahhc.org/2009/HP41C Press Release.jpg]HP41C Press Release[/link]
Jake Schwartz