Electric switches; electrical sensing edges for power operated doors and gates; electrical edge sensors; elongated electrical switches and infra-red switches and sensors affixed to the leading edges of power operated doors and gates; electrical sensing switches for industrial equipment and applications; noncontact electrical sensing edges and switches; electronic sensing systems comprising electrical sensing edges; infra-red sensors and electronic circuits for controlling the movement of power-operated doors and gates

'affix':25 'applic':43 'circuit':63 'compris':53 'control':65 'door':9,33,72 'edg':5,13,29,47,56 'electr':1,3,12,16,36,45,54 'electron':50,62 'elong':15 'equip':41 'gate':11,35,74 'industri':40 'infra':20,58 'infra-r':19,57 'lead':28 'movement':67 'noncontact':44 'oper':8,32,71 'power':7,31,70 'power-oper':69 'red':21,59 'sens':4,37,46,51,55 'sensor':14,24,60 'switch':2,17,22,38,49 'system':52

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