Apparatus for determining skin tolerance to ultra-violet radiation
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Device for measuring the ultra-violet radiation in the uv-a and/or uv-b range
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Oscillator for time measurement
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Indicator for skin susceptibility to UV radiation - uses UV radiation meter and three-aperture mask with two filters
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Installation for monitoring several persons or objects
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ELECTRONIC CLOCK
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ARRANGEMENT FOR MEASURING THE RADIATION DOSE OF NATURAL OR ARTIFICIAL RADIATION INTENSITIES, IN PARTICULAR ULTRAVIOLET LIGHT IN THE ERYTHEM-EFFECTIVE AREA
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PROCEDURE FOR SECURING FACILITIES AND TRANSPORTATION AND SECURING SYSTEM FOR CARRYING OUT THE PROCEDURE
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TIMING OSCILLATOR
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NUCLEAR BATTERY
ZA73993B
Electric energy source
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ONE-PIECE MINIATURE COLLETS, IN PARTICULAR FOR USE IN CLOCK DRILLING
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ELECTRIC CLOCK
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DEVICE FOR MEASURING ULTRAVIOLET LIGHT
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Method and apparatus for measuring the critical flicker fusion frequency
GB1376636A
Installation for monitoring several persons or objects
DE2111800A1
Process for determining the flicker fusion frequency and equipment for carrying out this process
