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What does HHDDT stand for? 

What does HHDDT mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: HHDDT.

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HHDDT

Highway Heavy Duty Diesel Transient

Miscellaneous » Automotive

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Maybe you were looking for one of these abbreviations:

HHCP - HHCS - HHCX - HHD - HHDD - HHDL - HHDR - HHE - HHEC - HHES

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