A power tool with a tool portion and at least one attachment. The tool portion has a tool body and a drill chuck. The drill chuck includes a rotatable spindle, a plurality of jaws that are coupled to the rotatable spindle and a cover that is disposed about the jaws and which is not coupled for rotation with the rotatable spindle. The attachment is coupled the cover of the drill chuck.

 
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> Transmitted-light base for a microscope, and method for regulating the illumination intensity of a transmitted-light base

~ 00450