Abstract: Apparatus and methods for preventing access to a telephone service by unauthorized users employ an access code preferably having a fixed component which identifies an authorized user, and having a plurality of variable components associated with the fixed component so that at least one of the plurality of variable components is currently valid for the purpose of processing a telephone call by the service. The variable component is changed from among the plurality of variable components with each telephone call in a predetermined sequence to prevent stealing of the access code by unauthorized users. A credit card may be employed listing the plurality of variable access codes in a predetermined sequence to allow the authorized user to determine which variable component will be currently recognized by the telephone service based on the number of telephone call made with the credit card.

Abstract: An automated pizza oven comprising a massive oven enclosure with a fire brick liner about a baking chamber and a massive fire brick turntable disposed in the baking chamber an forming the bottom surface thereof. A variable speed drive motor is connected with and slowly rotates the turntable. A pair of doors are provided for the baking chamber and a fire chamber employes coal or other natural fuel in open communicaation with the baking chamber. A pair of temperature sensors and a drive motor speed sensor respond respectively to baking chamber temperature and turntable speed and are fed to a control means for the regulation of turntable speed as a function of baking chamber temperature.