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Subject: Anybody know whose M marks these are?

From: "Brad" <unclefalter@...>
Date: 2016-07-12

Hey guys,

 

I just got some old Digital Group stuff, including one of their motherboards that was never built.  And I notice it has the same green color PCB I was looking for, and has these little M marks all over it, just like the original TV Typewriter boards did.  I’m wondering if there’s any way to find out what manufacturer this was and see if maybe I can track down (probably unlikely) some vintage PCB stock?

 

http://s1381.photobucket.com/user/unclefalter/media/20160711_153350_zpsqqr38jay.jpg.html

 

Brad