Fluid-pressure measuring apparatus; measuring apparatus, devices and instruments for detecting the presence or absence of fluid in conduits; ultrasonic detectors for measuring fluid pressure; all of the foregoing excluding apparatus or instruments for detecting, measuring or analysing smoke, fire, flames or heat

'absenc':16 'analys':39 'apparatus':5,7,32 'conduit':20 'detect':12,36 'detector':22 'devic':8 'exclud':31 'fire':41 'flame':42 'fluid':2,18,25 'fluid-pressur':1 'forego':30 'heat':44 'instrument':10,34 'measur':4,6,24,37 'presenc':14 'pressur':3,26 'smoke':40 'ultrason':21

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