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Passage direction regulating device
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Transmission reception integrated optical communication device
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Guard switch
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Wrench
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Optical axis correcting optical system
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Transmission/reception integrated type optical communication equipment
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ND filter
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Reference gauge for measuring instrument height of surveying instrument and instrument height measuring method
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Instrument height measuring method for surveying instrument
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End point limit circuit for direct-current motor for lens
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Drawing instrument
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Housing table for scale for drafting machine
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Housing container for longitudinal rail of drawing instrument
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Nd filter
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Right angle collimation level and adapter therefor
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Super-wide angle lens system using aspherical lens
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Zonal nd filter
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Nd filter
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