Abstract: A ball launcher has a body and a ball conveyor. The body has a sidewall defining axial bore, an attachment for attaching to a tubing string, and at least one radial port that provides access though the sidewall to the axial bore. The ball conveyor is carried by the body adjacent to an associated radial port. The ball conveyor comprises an inner bore in communication with the associated radial port and extends laterally outward from the body. A shaft extends along the inner bore, the shaft having a helical flight having at least one turn around the shaft, the flight and a bottom portion of the inner bore defining a ball receiving space large enough to receive a ball to be launched. A drive source rotates the shaft in a first direction to cause the flight to advance one or more balls toward the radial port.

Abstract: A circuit breaker includes a housing, a rigid circuit board, and a flexible circuit board. The rigid circuit board is enclosed within the housing and has a main surface for supporting an electronic component. The flexible circuit board has a first end that is directly attached to an edge of the rigid circuit board.

Abstract: A ball launcher has a body and a ball conveyor. The body has a sidewall defining axial bore, an attachment for attaching to a tubing string, and at least one radial port that provides access though the sidewall to the axial bore. The ball conveyor is carried by the body adjacent to an associated radial port. The ball conveyor comprises an inner bore in communication with the associated radial port and extends laterally outward from the body. A shaft extends along the inner bore, the shaft having a helical flight having at least one turn around the shaft, the flight and a bottom portion of the inner bore defining a ball receiving space large enough to receive a ball to be launched. A drive source rotates the shaft in a first direction to cause the flight to advance one or more balls toward the radial port.

Abstract: A circuit breaker includes a housing, a rigid circuit board, and a flexible circuit board. The rigid circuit board is enclosed within the housing and has a main surface for supporting an electronic component. The flexible circuit board has a first end that is directly attached to an edge of the rigid circuit board.

Abstract: A device for instructing mathematics includes a work surface and a plurality of movable elements. Each of the movable elements includes, on a front surface thereof, at least a portion of a visible mathematical symbol (including numeric and nonnumeric symbols) thereon readable via eyesight. Each of the movable elements further includes an attachment member on a rearward surface to attach the element to the work surface. The attachment member preferably allows the element to be removed from the work surface and to be slidably positionable to any position on the work surface once attached thereto. The device can further include a frame around the work surface. Preferably, the frame defines a boundary for positioning of the movable elements. In one embodiment, magnetic attraction is used to maintain the attachment member in movable connection with the board.

Abstract: A system is provided for enabling the communication between a handheld device 26 and a circuit breaker (18a, 18b, 18c). The system comprises an electronic circuit breaker (18a, 18b, 18c) including an RFID component (54) having an RFID module (56) for storing data and a microcontroller (50) connected to the RFID module (56) and controlling the operation of the breaker (18a, 18b, 18c) in accordance with the data; and a handheld device (26) for communicating with the electronic circuit breaker (18a, 18b, 18c), the handheld device (26) including a microcontroller (50) controlling the operation of the handheld device (26) and a communicating component (82, 86) connected to the microcontroller (80) communicating wirelessly with the electronic circuit breaker (18a, 18b, 18c).