satellite receivers, mobile data receivers, handheld computers, and a computer software program sold as a component of handheld computers, all for use in gathering topographic data, calculating the grade or slope of topographical surfaces and pipelines, and generating three-dimensional topographic models

'calcul':27 'compon':16 'comput':7,10,19 'data':4,26 'dimension':41 'gather':24 'generat':38 'grade':29 'handheld':6,18 'mobil':3 'model':43 'pipelin':36 'program':12 'receiv':2,5 'satellit':1 'slope':31 'softwar':11 'sold':13 'surfac':34 'three':40 'three-dimension':39 'topograph':25,33,42 'use':22

WM-TOPO

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