Thanks Carl.  I'm pretty sure that this lock dates to the early 20th
C.
 
> Niels--Check patents but I think all Yale locks date after 1842--Carl Steen
>
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Niels Taylor
Staff Archaeologist
South Carolina State Historic Preservation Office
 
South Carolina Department of Archives and History
1430 Senate Street
P.O. Box 11669
Columbia, SC 29211
(803) 734-8612