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1975-01-28
Orientation indicating apparatus
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1974-12-03
Method for determining the translucency and/or turbidity of a medium and apparatus for applying the method
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1980-07-02
Device for indicating a horizontal or inclination thereto and one or more angular deviations therefrom
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1981-03-03
Digital angle indicator
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1976-10-30
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1982-06-01
Directional two axis optical inclinometer
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1972-07-11
Vertical reference pendulum
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1978-06-27
Zero index for electro-optical measuring device
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1985-11-06
Electronic level
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1961-12-05
Photoelectric leveling device
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1969-03-18
Focal plane micrometer for reading the scales of engineering instruments
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1970-12-29
Weighing machine which gives a signal when a specific position of measuring is exceeded
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1966-03-01
Photometric gage for finding perpendiculars to surfaces
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2002-06-19
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1974-11-05
Оптический измеритель перемещений
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1988-09-07
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1967-07-25
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1977-09-05
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1990-07-15
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Keitz
1971
Measurement of Illumination
Fuller et al.
1971
The photometry of the flow of light
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1989-05-30
Фототеодолит
PL90586B1
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1977-01-31
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US2189516A
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1940-02-06
Inclinometer