[Beermotor]

IIRC it was initially employed for their payroll system to help print checks.

[p_l]

First commercial use in Bell Labs is usually credited as the secretarial pool for writing patent applications.

[somat]

I always give an ironic chuckle when fighting the print system on a unix machine(lpd, lp, cups...) the internal rant that goes with it is something like.

"Printing was THE original purpose, the reason for existence, of unix, you would think it would be a solved problem instead of the terrible mismatch of sins that it is."