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Siemens MS-51
?MS? Series Single Action Manual Fire-Alarm Station; Normally Open, S.P.S.T.
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Surface Backbox for MSM-Series Manual Stations
Manual Station, Metal w/ Key, Double Action
?MS? Series Single Action Manual Fire-Alarm Station; Normally Open, S.P.S.T.
Single-Pole, Single-Throw (S.P.S.T.) Manual Station
Addressable Manual Fire-Alarm Box, Single Action
Addressable Manual Fire Alarm Box, Single Action
Addressable Manual Fire Alarm Box, Single Action
Addressable Manual Fire Alarm Box, Dual Action
Double-Action Addressable Manual Fire Alarm Box