Narrow kitchen window. Crank style. Plastic gear teeth broken. Can open but cannot close
Bob from SWISCO responded:
May 29, 2020
This looks like an old Andersen operator. See either the 39-146 and 39-147, or the 39-094 or 39-095. Look over the dimensions and style of link arms for each set and see if either matches what you need. See what you think.