> > Crescent
> > Monkey wrench
> > Adjustable spanner
> > 
> Spanner (as a wrench) was used by Mark Twain in his story
> "Roughing It", ca. 1880.  See Gutenberg press.

My friend's plumber dad, UK early 70s, would ask for him to
"pass the monkey', ie "plumber's wrench"

http://images.acclaimimages.com/_gallery/_TN/0279-0605-2400-0515_TN.jpg

Never heard it referred to as a 'plumber's spanner'

I've read a definition somewhere that said 'spanner' was the
correct term for an adjustable 'wrench', but it seems a thing
for working with nuts and bolts is whatever you want to call
it

eg the Google image results for 'box spanner' are what I'd
variously call 'spanner', 'ring spanner', 'plug spanner' (with
tommy bar) or 'socket'. I had once what I'd truly call a 'box
spanner'. A bar with a cube at each end, each with 6 different
size 'closed spanners'

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