Might be made by Viking a window looks similar and it's a Viking

A home owner from Livermore,Ca says:
Looking for this sliding glass door lock and how to get it out of the door frame ?
User submitted photos of patio door hardware.
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Tom from SWISCO responded:
Please see our 82-032 handle set and 82-218 mortise lock. I think these could work for you. You should be able to just unscrew the handle set to remove it. For the mortise lock, see the video below. These can be a little trickier.
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