By A Mystery Man Writer
This button BS34D is divided into light-transmitting type and opaque type according to the material of the plate surface. For the specific difference,
XIZI OTIS Elevator Button BS34D
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List of Shanghai Mitsubishi elevator fixtures, Elevator Wiki
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Otis Elevator Push Button Wholesale
For OTIS (XIZI OTIS) Elevator Push Buttons Round Stainless Steel Braille Button BR32 BR32A(B) Blue / White / Red Light 3 / 4 Lines Lift Spare Parts