Jalouise window

A quick learner from Braintree MA says:
I have 9 of these windows and cannot figure out how to open them. I will replace the mechanism if necessary. I've searched and cannot find a name brand on any of the windows. Any help will be appreciated.
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Bob from SWISCO responded:

This looks like it might be our 39-076 Center Gear Operator. This operator works with a handle that inserts and is used to turn the window open. Unfortunately, that handle is no longer made and it's not something we can supply. I am very sorry for the inconvenience. 

39-076 : Center Gear Operator
Center Gear Operator
39-076
$39.97
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