it's a model ADX and just look at that logo 😍
it has some stuck keys but experience with these things tells us that may be entirely because the motor isn't running. the bottom case has access points in it which are a good indicator of the locations of screws or gears that may sometimes need a little manual assistance, as well as locations where lubrication was applied. and the excess of old grease on the gears indicates maybe it was lubricated instead of fully serviced a few times too many, causing everything to jam up with a lovely dirt-grease combo. so *hopefully* we can get it moving again with just a little careful cleaning and re-lubrication. because taking these things all the way apart is... not fun.
this site has a very thorough description of a similar model: http://www.johnwolff.id.au/calculators/Tech/MarchantDRX/Intro.htm. our other dividing machine, a Friden STW, is less elegant looking but also (comparatively) easier to service - and we still don't like pulling it apart, because it's finicky. there's something like 10,000 individual parts inside. just to do basic 4-function arithmetic.
@mediaarchaeologylab I was reading somewhere that many marchants had multiple planetary gearsets to drive each digit on the display. That's an amazing amount of assembly.
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