Mystery mid-70's keyboards

[Fred Cisin]

>>> 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

> On Sat, Dec 28, 2019, 12:38 PM Bill Degnan <billdegnan at gmail.com> wrote:
>
>> My initial thought is a clone dec terminal printer keyboard.

> But that cant be right

"marg set" sounds like a word processor.