G08B 5/20
Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using hydraulic transmission; using pneumatic transmission with indicator element moving rectilinearly with reset means necessitating a separate operation to return the indicator element
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Edits on 5 Mar, 2022
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G08B 5/20
Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using hydraulic transmission; using pneumatic transmission with indicator element moving rectilinearly with reset means necessitating a separate operation to return the indicator element
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