| http://www.w3.org/ns/prov#value | - With realizable small designs, the central station 30 and the digital ringers 50 can be installed at any convenient location, such as on a desk or on a wall. [0125] Both the central station 30 and the digital ringer 50 have components mounted on a printed circuit board which is, for example, a FR4/G10 fiberglass or a low cost phenolic material.
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