A heated construction box includes a power connector for connection to a power source and a heater constructed for generating heat within the construction box when connected to the power source. The construction box may function as a warmed seat, heated office, heated workbench, for example, and may attach to a vehicle such as a bed of a pick-up truck. In one embodiment, the power source for the construction box may provide 12V and be removed for remote recharging.

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> Opto-electronic encoder with three-dimensional scales

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