Searching for Hinges us paten 4980947

A quick learner says:
My casement window left hand side hinges was broken as pictures
There are pattern number on hinges US Pat 4980947
Please help to find the right parts for replacement
Thanks
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Emily from SWISCO responded:

Hello!

Start by taking a look at our 36-048 or 36-049 2-bar hinge set. Look over the dimensions for each and compare them to yours to see if either of these match what you need. 

How to Replace a 2-Bar Hinge Set on a Casement Window
How to Replace a 2-Bar Hinge Set on a Casement Window
VIDEO
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