Canon P mystery

My understanding has always been that the TE marking is the final form of the Central Purchasing Office markings and was used, for a short time only, after the CPO and EP diamond marks. Were that the case, then it makes plenty of sense that it'd stand for Tax Exempt.
 
Thank Nikon Liu for the information on Nikon engraved with T.
There was an article on Nikon Historical Society Journal #53 page 8 (Sep 1996 issue) about those engraved Nikons. I am wondering anyone can share the article with us.
 
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