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There is no minimum sill height then or now. The code stipulations regarding sill height are that any glass within 18" of the floor must be tempered glass and the maximum sill height for an egress window is 44".
I don't have access to the code from that time period. I'm going to open this up to my colleagues so one of them can help. Please don't respond (even to acknowledge this post)until you get a response from us. If you respond first it will only delay your answer.