According to Metcalfe it's the 22nd of May - or at least it was for the 30th anniversary.

http://www.computerworld.com/s/article/81274/Q_A_Ethernet_s_creator_describes_its_past_future

� Scott


On Mon, Apr 8, 2013 at 10:40 PM, Andy Linton <asjl@lpnz.org> wrote:
On Sat, Apr 6, 2013 at 11:18 PM, Richard Naylor <richard.naylor@r2.co.nz> wrote:

> 22 May is the 40th for Ethernet - when Robert Metcalf wrote his memo
> outlining ethernet to his Boss.

This memo shows that we may be a little premature (see date of 5 March
1974) and said boss didn't think much of the idea!

They were working on this in 1973 but the patent wasn't file until 1975.

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