Biometric fingerprint door locks; Digital door locks; Electrical and electronic burglar alarms; Electronic locks; Locks, electric; Magnifying peepholes for doors; Optical character recognition apparatus; Padlocks, electronic; Radio-frequency controlled locks

'alarm':12 'apparatus':24 'biometr':1 'burglar':11 'charact':22 'control':30 'digit':5 'door':3,6,20 'electr':8,16 'electron':10,13,26 'fingerprint':2 'frequenc':29 'lock':4,7,14,15,31 'magnifi':17 'optic':21 'padlock':25 'peephol':18 'radio':28 'radio-frequ':27 'recognit':23

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