"Typical" awning window operators all look like the illustration shown here. However, there are quite a few variations in their "footprints" and their linkages. These variations can be divided into the following types.
"L" base, two holes up, two holes down.
"L" base, one hole up, two holes down.
"L" base, one hole up, two offset holes down.
"I" base, two holes up, two holes down.
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