Definitions from Wiktionary (TSB)

▸ noun:  Initialism of Transportation Safety Board (“Canada”).
▸ noun:  Initialism of Transport Safety Board (“Japan”).
▸ noun:  Initialism of Trustee Savings Bank.
▸ noun:  Initialism of technical service bulletin.
▸ noun:  Initialism of traffic signal box. [(US, Australia) Any of the large metal boxes containing traffic signal controls, found at roadsides and intersections, and often made available by the local council for artistic work.]
▸ noun:  Initialism of transportation safety board. or transport safety board [A government body responsible for investigations into transportation accidents to determine their cause and recommend courses of action to prevent or mitigate future similar incidents]



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