Not all motors are reversible. The windings, brushes, or type of gearing
can influence if the motor is CW, CCW, or dual. Single-direction DC
motors are not uncommon for the larger gear motors you may find in
surplus. Burden's has always listed their motors in this fashion, for
Freescale has some fairly nice motor tutorials that explain some of
I like it when companies specify that a motor is reversible or dual.
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