Manufacturers Code
From 1939 a manufacturers code was added to designations to easily identify the manufacturer and the production plant. The code was a two letters for example F-15E-50-MC the MC being the code for the McDonnell Douglas plant at St. Louis, Missouri.
Read more about this topic: 1962 United States Tri-Service Aircraft Designation System
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“Motion or change, and identity or rest, are the first and second secrets of nature: Motion and Rest. The whole code of her laws may be written on the thumbnail, or the signet of a ring.”
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