Tanks for the quick responce Tony! He models 1972, so TVI may not have been invented yet during the time of this list?
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My ORER copies from the 1940s and 1950s have no "TV"
classification. The suffix "I", as you surmise, means "insulated."
Might he mean "TW"? That's a tank with a wooden container.
Tony Thompson Editor, Signature Press, Berkeley, CA
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