From an Inspection and Test Checklist for flange heaters (the number is the same on both lines):
I wonder what the difference between "Design Drawing" (or is it "Drawings"?) and "Manufacturing Drawing(s)" is. Is it that Mfg. Dwg. merely represents some part of Design Dwg. (sheet no.3) that is copied for use in the production shop? Or are there some additions\changes?
Sorry if this is a very basic question. I tried to translate this document and dropped the translation because I found it quite hard to understand many of the terms used, especially in the condensed context of a checklist. But I remembered some terms, and it made me curious.
P.S. I was told on a translators' site that it could possibly mean "Manufacturer's Drawing Number" in this context. I wonder if that's true.