Abstract: The invention provides an improved apparatus and method for removing oxidized and embedded scale from sheet metal by high pressure spraying a diluted hydrochloric acid water mixture onto the surface of the sheet metal. The contaminated water/acid solution is then re-circulated to remove ferrous chloride from the acid and water solution. The cleansed acid and water solution are recycled for reuse. The sheet metal is rinsed with hot water, dried, oiled and rolled. The rinse water is re-circulated to remove acid droplets and the acid droplets are recycled to an acid storage tank. Any contaminants removed from the rinse water are recycled to a combination filter and reverse osmosis system. The clean rinse water is reused to rinse further sheet metal.

Abstract: A fishing device is shown with a number of advantages. A fishing line is not coupled to the device, thus providing ease of use, and improved casting ability. A vibration sensor is used to detect only fish. The vibration sensor can ignore extraneous motion such as waves, bait, etc. A fishing device is shown that provides multiple states of fish activity such as normal, currently striking, and missed strike. Further, a fish activity state can be transmitted to a remote device thus giving the fisherman more freedom to move about while the rod is left unattended.

Abstract: A pet feeding system is provided. One system uses pulse width identification to provide a more effective identification of a unique signal from a remote circuit on a pet tag. One system described is capable of identifying more than one remote circuit, such as two or more pets, at the same time. Further, one system includes the ability to detect a large distance range using inexpensive circuitry. A desired range can be user selected from a range of distances, using a control such as a potentiometer.