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Definitions of 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]
