Apparatus and instruments consisting of laser beam emitting devices and distance and angle measuring devices for aligning building construction layout lines to provide orthogonal corners and a level horizontal plane above a supporting ground surface

'align':17 'angl':13 'apparatus':1 'beam':7 'build':18 'consist':4 'construct':19 'corner':25 'devic':9,15 'distanc':11 'emit':8 'ground':34 'horizont':29 'instrument':3 'laser':6 'layout':20 'level':28 'line':21 'measur':14 'orthogon':24 'plane':30 'provid':23 'support':33 'surfac':35

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