[ Circular slide rules; ] Distance measuring apparatus; Electronic timers; Instruments for measuring length; [ LED vehicle traffic signals; ] Measuring rulers; [ Photoelectric sensors not for burglar alarms or systems; Rotating lights not for burglar alarms or systems; ] Scales; Slide-rules [ ; Weighing scales ]

'alarm':24,32 'apparatus':6 'burglar':23,31 'circular':1 'distanc':4 'electron':7 'instrument':9 'led':13 'length':12 'light':28 'measur':5,11,17 'photoelectr':19 'rotat':27 'rule':3,38 'ruler':18 'scale':35,40 'sensor':20 'signal':16 'slide':2,37 'slide-rul':36 'system':26,34 'timer':8 'traffic':15 'vehicl':14 'weigh':39

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