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E. R. Watts & Son, Ltd., London (5)

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surveying -- instruments (5)
C5-D3 (5)
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Watts' "Quickset" Level

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Watts' Drawing Office Supplies

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The "Microptic" Marine Torsionmeter

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Watts Geophysical Surveying Instruments : New Vertical Magnetic Force Variometer

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Evans Inclinometer for Indicating the Deviation Of Boreholes From the Vertical

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