Mystery mid-70's keyboards

[Jules Richardson]

Hey all,

I was wondering if anyone knows what system either of these two keyboards 
came from:

1) APL keyboard made by Maxi-switch, IC date codes in 1976, p/n 2129-009, 
keyboard encoder has "NKBD-452 03-004-05":
   http://www.classiccmp.org/acornia/tmp/maxi.jpg

2) Keyboard branded as Licon 55-500129, IC date codes in 1973 and '74. Has 
three blank white keys, one blank gray key, and one blank black key, also 
"home mem", "marg set" and "video rvs":
   http://www.classiccmp.org/acornia/tmp/licon.jpg

I picked up both hoping that at least one would be simple parallel output 
and so useful for homebrew stuff, but I am curious about what they 
originally came from.

cheers

Jules