parking guide and vehicle collision warning system, comprising software, distance display, speakers, ultrasonic sensors and warning alarm to assist a driver in backing a vehicle safely; ultrasonic instrumentation comprising ultrasonic level meters, dual channel level meter, sludge level meter, sludge density meter, open channel flow meter and gas flow meter

'alarm':17 'assist':19 'back':23 'channel':34,44 'collis':5 'compris':8,29 'densiti':41 'display':11 'distanc':10 'driver':21 'dual':33 'flow':45,49 'gas':48 'guid':2 'instrument':28 'level':31,35,38 'meter':32,36,39,42,46,50 'open':43 'park':1 'safe':26 'sensor':14 'sludg':37,40 'softwar':9 'speaker':12 'system':7 'ultrason':13,27,30 'vehicl':4,25 'warn':6,16

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