Jalouise window

A quick learner from Braintree MA says:
May 21, 2021
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.
Thumbnail of the uploaded file named image.jpg
Thumbnail of the uploaded file named image.jpg
Thumbnail of the uploaded file named image.jpg
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Bob from SWISCO responded:
May 25, 2021

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. 
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