| http://www.w3.org/ns/prov#value | - A combination according to claim 7, wherein the means for removing and replacing is a rotary tray having a plurality of stations and including means for rotating said tray, said tray being positioned so that when the device to be serviced is withdrawn into the housing, the portion thereof to be replaced is at a station, and upon rotation of the tray, the portion of the device to be replaced is rem
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