Sliding door handle broken, need to find replacement

A quick learner from Edwards, CO says:
Inside of handle reads:Sash Controls Ferndale MI
U.S. Patent 5125708
other side reads
u.s.patent 5125703
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Tom from SWISCO responded:
I'm afraid that information doesn't point us to any one handle set in particular. Would you be able to show us a couple pictures of the hardware in question? That will help us find what you need.
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