Air quality measurement apparatus, namely, particle counters; Densimeters; Microscopes; Optical apparatus and instruments, namely, optical ports for underwater photography, dome ports for underwater photography, wet diopters, adapter lenses for underwater photography; Road signs, luminous or mechanical; Semi-conductors; Slide-rules; Phototelegraphy apparatus; Precision balances; Prisms for optics purposes

'adapt':27 'air':1 'apparatus':4,11,44 'balanc':46 'conductor':39 'counter':7 'densimet':8 'diopter':26 'dome':20 'instrument':13 'lens':28 'lumin':34 'measur':3 'mechan':36 'microscop':9 'name':5,14 'optic':10,15,49 'particl':6 'photographi':19,24,31 'phototelegraphi':43 'port':16,21 'precis':45 'prism':47 'purpos':50 'qualiti':2 'road':32 'rule':42 'semi':38 'semi-conductor':37 'sign':33 'slide':41 'slide-rul':40 'underwat':18,23,30 'wet':25

NAVIGOSCOPE

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