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Those were part of a closed circuit TV system for enlarging printed material for the visually impaired. There was a camera unit that was attached to a movable shelf that a book or other printed material could be placed upon. The Camera unit had controls for size, focus, etc. That unit was probably made between the mid '80's to early '90's.
I have a 12" self contained version from '84 that is branded "Visualtek". It was sometime in the mid to late '80's when they shortened the name to "Vtek". In 26 years, the only trouble that mine has given is shorted power supply diodes on two occasions. IIRC, mine uses an Amperex CRT. OTOH, the identical model at school was always giving some kind of trouble. These were costly when new. I think my parents paid around $2.5K for mine.
These were also made with a green CRT.
By the time I got to college, they had upgraded to nicer models with high resolution color monitors.
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