Abstract: Improved methods to detect when a human body contacts a predetermined portion of a machine are disclosed. The methods distinguish contact with a person from contact with other materials. The methods are particularly applicable in woodworking equipment such as table saws to distinguish contact between a person and the blade of the saw from contact between the blade and wet or green wood.

Abstract: An interactive advertising system is adapted to identify, measure and track consumer exposure to a number of different advertisements and to expose consumers to several different advertisements. The system simultaneously identifies and measures the number of consumers viewing different advertisements, while displaying different selected advertisements for viewing by the consumer. The system includes a display for displaying advertisements and other information. The system functions in either one of an idle mode, wherein potential consumers are not within a sensed proximity range, and an active mode, wherein the presence of potential consumers within the proximity range is detected. In the idle mode, the system displays programmed non-advertisement information. In the active mode, the display projects a programmed sequence of advertisements, that includes full-motion color commercials that may be interspersed with other information.