Searching for L LEMCO CROFT METAL PRODUCT

A quick learner says:
Hello
In dire need of a replacement crank operator.
Picures attached but in case you cannot see, the words written on the shaft is
L
LEMCO

CROFT
METAL
PRODUCT

MCCOMB
MISS

PATENT NO [***I cannot read all of the numbers***]
28306??
2852??
64???
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Emily from SWISCO responded:

Hi there!

I don't recognize this operator at first glance but I'm going to have one of our senior experts take a look and see if they could recommend a replacement for you. We'll reach out as soon as more information is available. 

Thanks so much!

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Dave Sr. from SWISCO responded:

Your LEMCO operator is no longer available. Take a look at our 39-256B Look-Rusco operator, this looks like it has the same mounting hole locations as yours. However, you might need to drill out the end hole in the link arm to a 3/8" hole to attach it to your linkage in the window. 

As for the other two operators, they do have the 3/8" hole you need, but you will have to drill new bottom mounting holes.

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