Ahwe used them a lot, when lasers were expensive.They also could be used with special endless carbon paper (Durchschlagpapier) to get immediate copies (even 4), one for you, one for the customer and one for the archive as backup and so on. Cleaning those heads and exchanging the tapes everyday while having a chat with the people in the office, was a fun thing. They were quite robust. Some of them also could print 2d barcodes (for archiving or using with scanners which emulated key presses to feed order id's and stuff fast to the erp)
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