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phân loại:

Single ladder color screen display board (mechanical button)

Parallel color screen display board (mechanical button)

Single ladder color screen display board (touch button)

Parallel color screen display board (touch button)

Single elevator complete set of outbound call (mechanical button)

Parallel set of outbound calls (mechanical button)

Single elevator complete set of outbound calls (touch button)

Parallel set of outbound calls (touch button)

Individual base station lock