4. Optics: measuring and testing
  5. By dispersed light spectroscopy
  6. Utilizing a spectrometer

John R. Lansdowne

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Advanced downhole periodic seismic generator

Acoustics – Geophysical or subsurface exploration – Well logging
Patent

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Chair with canopy

Furnishings – Furniture – freestanding support – or frame therefor – Seating unit
Patent

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Combination rafter square and level

Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Geometric
Patent

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Construction crane base

Traversing hoists – Methods
Patent

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Curio

Jewelry – symbolic insignia – and ornaments – Sculpture – table or wall ornament – Simulative
Patent

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