Double Hung window hardware

A contractor from Santa Fe, NM says:
I am trying to identify this window balance, I have searched for a manufacturers name to no avail, it is not on the window lock or stamped anywhere. Do you have any idea who might be the manufacturer of these windows.
Morgan
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Casey from SWISCO responded:

Hello,

The part you've pointed out in the photo looks like the part of the window that holds the balance, which is called a jamb liner. If that is the part you need, unfortunately, we do not supply it but a local millwork may be able to assist you. 

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