Tom from SWISCO responded:
July 6, 2012
Thanks for contacting us. This operator appears to be similar to our 39-089 & 39-090 window dyad cranks. You could also look at our 39-187 & 39-188. Are these the product numbers you were referring to? Our 39-089 & 39-090 are similar to our 39-187 & 39-188 except for their crank arms; between the two pairs, they each have a different zigzag shape position.
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