200 Propulsion Machinery

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230 Propulsion Prime Movers
        Engines
    231 Gasoline Engines
        Atomic 4
        Palmer
    233 Diesels
        Perkins
        Yanmar
    235 Electric Propulsion
        Electric Propulsion
    236 Outboards
        Tohatsu
240 Transmission & Propulsor Systems
   242 Couplings
   243 Shafting
   244 Bearings
   245 Propellers
250 Propulsion Support Systems
   252 Propulsion Controls
   256 Cooling Sea Water
   259 Exhaust
        Engine Exhaust Systems
260 Fuel & Oil System
290 Special Purpose Systems