Yes, that makes a lot more sense. The cylinder heads are held on
by just a few wimpy looking rods, which couldn't support even a
very low pressure without leaking. But if it's intended to draw
a vacuum in the cylinder, they'd be self-sealing.
658- A vacuum powered motor that drives the paper roll of a player piano.
It's unusual in that roll motors usually
use bellows rather than pistons, but there were a tons of different player
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