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big meat trio? 
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as was indicated earlier in the thread.. it's definitely not Big Meat TRIO... why..
Classic Italian B.M.T.
(ham, Genoa salami, pepperoni, bologna)
a trio indicates 3... this sandwich has 4 meats
also check
THIS out
1975 - The chain?s flagship sandwich, the classic BMT, is first introduced. Going along with the subway transportation theme, it is named for the Brooklyn-Manhattan Transit system; later it is known as Biggest, Meatiest, Tastiest. The first Subway in Massachusetts opens in the city of Springfield. The Watergate scandal is in full throttle, and "Saturday Night Live" aims its satirical wit at all targets. Red Ford Torinos with white stripes cruise the nation?s highways as "Starsky and Hutch" fight crime on prime time.
So.. it started out as being named for Brooklyn-Manhattan Transit ... then became known as Biggest, Meatiest, Tastiest. We have TWO winners
