[GreenKeys] Morkrum M12

[Jim Haynes]

I've never seen a Model 20 close up, but the 21A printer does have
a latching mechanism, so that the electromagnets are operated one at
a time as the receiving distributor sweeps over its brushes.  The
magnets themselves don't latch, but they release mechanical latches
that activate the code bars when the machine is about to print.


jhhaynes at earthlink dot net