4. Optics: measuring and testing
  5. By polarized light examination
  6. With light attenuation

Shoichi Sakanishi

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Apparatus for detecting position of underground excavator

Boring or penetrating the earth – With signaling – indicating – testing or measuring – Tool position direction or inclination measuring or...
Patent

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Apparatus having a pair of magnetic field generating cables for

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent

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Laser device

Coherent light generators – Particular beam control device – Optical output stabilization
Reexamination Certificate

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Laser device management system

Data processing: generic control systems or specific application – Specific application – apparatus or process – Product assembly or manufacturing
Reexamination Certificate

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Method and apparatus for detecting collapse of natural ground in

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
Patent

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Profile ID: LFUS-PAI-P-333893

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