nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpq7j6e9g9pjzvp2xc4pmq5fyjuetpxj7v3r4pmqq2hychhvwpenq4qsps6x2 (nprofile…s6x2) it's the word "portable" there that got my attention!
When I was routinely using microfiche readers they were quite large. The trickiest part was how the mechanism allowed for manipulation of the microfiche in both broad movement and finely positioned.
So how does a small device provide such variable precision?
Also, some had printers but I have zero recollection of what their technology was.