4. Measuring, testing, or signalling instruments
  5. Measuring, regulating or indicating instrument, or casing
  6. Geometric

Donald F. Kennedy

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Multi-function spirit-level

Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent

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Polyfunctional spirit-level

Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent

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Spirit level

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

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Spirit level

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

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