| http://www.w3.org/ns/prov#value | - ve the mirror glass, and spherical or electrochromic glass is used which occupies more space, sealing is required against water, dust, heat, ice, saltpetre, chemical products or UV rays, and others such as consumption, temperature loss, heater, traction cables for the manual version, electrical cables, connectors, temperature sensor, painted cover, memory units and protection circuits, inter alia.
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