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Company Products>Elevator Telephons ADA Elevator Telephone JR503h-hSDh-hBI  Product Introduction  See Big Picture Brief： Elevator Telephons ADA Elevator Telephone JR503-SD-BI Model Number:JR503-SD-BI This Elevator Emergency Telephone meets a wide variety of customer requirements. Designed to comply with the latest ADA code, manufactured to a high standard, and ensure that the primary function of communications is maintained at all times. http://www.jrtelephones.com。