"too closely" hardly qualifies IMO as "indistinguishable". Maybe I'm a printer nerd, but I could generally tell the printer manufacturer from its output in the

"too closely" hardly qualifies IMO as "indistinguishable". Maybe I'm a printer nerd, but I could generally tell the printer manufacturer from its output in the time they were popular. Not to mention that back then, I don't think any consumer-grade dot matrix used single sheet paper like a typewriter would. The tractor punched-hole bars on the side after removal would give it away; even that fancy super-perforated stuff.