Awning window operator

A handy person from Greenville, SC says:
I'm trying to repair a awning window operator. It controls 3 separate panes. House was built in late '50s. Can you help me find the correct part?

Thanks,
Steve
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Bob from SWISCO responded:

Hi Steve. Start by looking at our 39-054 or perhaps our 39-259. These both have similar configurations to your old operator. Carefully review all the pictures and dimensions listed on each shop page, and see if either of these operators match what you need. 

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