Stepper Info needed

Hi gang,

I've just come across a couple of little stepper motors and would be
grateful if anyone could shed any light on their specification - current,
voltage etc.
They are bipolar Sigma Instruments model 20-2220D-28100. I believe Sigma was
taken over by Pacific Scientific 5 or 6 years ago so thiat may be why I
can't find any info on the web. Thanks,

Ian

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Ian W. Wright
Sheffield UK