Provided is a metal shell cutting and assembling machine for cutting a material tape with metal shells and assembling the metal shell with a plastic body of a connector. The naphthoquinone derivatives of the present invention are related to the compound known as \u03b2-lapachone pyran-5,6-dione). The gear arrangement also includes a plurality of gears at least partially disposed in the housing and engaged with respect to one another. The meter base defines a rear panel of the electric meter.