I found this link by accident today :
http://164.195.100.11/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1='4,800,492'.WKU.&OS=PN/4,800,492&RS=PN/4,800,492
This Patent was registered by Coca-Cola in 1989. They use a HP-71B with the HP-IL 82165A GP-IO interface as a Data Logger for Post Mix Beverage Dispensing System. Does anobody here ever heard of this system??
BTW, when you're on the page, click on the Image icon in the bottom of the page. You'll be able to see the content of the Patent. If you can't see it, click on Help on top of the screen and install the plug-in called AlternaTIFF.