Abstract: An electrical connection system includes a first electrical connector, a second electrical connector, and a locking plate. The second electrical connector having one of a projecting boss and a boss opening. The locking plate is connected to the first electrical connector and has the other one of the projecting boss and the boss opening. The engagement of the boss with the boss opening locks the second electrical connector to the first electrical connector.

Abstract: An electrical connection system includes a first electrical connector, a second electrical connector and a locking device. The first electrical connector has a first housing with one or more locking indents. The second electrical connector has a second housing with one or more slots. Each of the slots in the second housing is in alignment with one of the locking indents in the first housing when the second electrical connector is coupled to the first electrical connector. The locking device has one or more arms and each of the arms has one or more projections. Each of the projections extends into one of the locking indents in the first housing through one of the slots in the second housing when the locking device is seated over at least a portion of the second housing to lock the first electrical connector to the second electrical connector.

Abstract: A panel heater for animals of generally rectangular slab-like shape. The panel heater has sloping sides to accommodate animals and comprises basically a shell into which a fire retardant material is poured around electrical resistance wire. Anchorage is provided to ensure that there is adequate keying between the fire retardant material and the shell to prevent degradation during use. Various support devices are provided for the heating element which is formed from an electrical resistance wire. A two-stage pouring of the fire retardant material is used to prevent the possibility of accidents by keeping the electrical resistance wire away from the outer surface.

Abstract: A method and apparatus to encode a video signal representing a moving picture, the method comprising:receiving successive frames of a video signal;coding each frame of the video signal with reference to a preceding frame of the video signal, so generating a first set of data which, when reconstructed, represents a first playback mode of the moving picture;coding each frame of the video signal, where n is an integer, so generating a second set of data which, when reconstructed, represents a second playback mode of the moving picture;decoding the first set of data to produce a first reconstructed video signal;decoding the second set of data to produce a second reconstructed video signal;calculating the differences between a frame of the second reconstructed video signal and a frame of the first reconstructed video signal corresponding to the frame succeeding the frame of the second video signal and, when the differences exceed a threshold, coding the differences and so generating a further set of data.