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VINTAGE
This is a DORRCO pocket booklet
“Conversion factors for engineers”
It’s very old has some writing on the cover and the left binding is showing wear. Copyright 1933 see photos. 
OVERALL, THIS IS A FANTASTIC PIECE OF HISTORY, in great shape for its age.
This was my father‘s and we can no longer maintain these objects from his history. Looking for a new loving home thank you 
