Distance measuring apparatus; range finders; distance recording apparatus; slope indicators; logs [measuring instruments]; surveyors' levels; levels [instruments for determining the horizontal]; levelling instruments; sounding apparatus and machines; directional compasses

'apparatus':3,8,25 'compass':29 'determin':19 'direct':28 'distanc':1,6 'finder':5 'horizont':21 'indic':10 'instrument':13,17,23 'level':15,16,22 'log':11 'machin':27 'measur':2,12 'rang':4 'record':7 'slope':9 'sound':24 'surveyor':14

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