HELIOSTAT is validvalid

an instrument using a mirror to reflect sunlight in a fixed direction, used for studying the sun or signalling messages

101,418 of 196,601 in NWL2023·also valid in CSW24

an instrument using a mirror to reflect sunlight in a fixed direction, used for studying the sun or signalling messages

108,476 of 280,887 in CSW24·also valid in NWL2023

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