Abstract: An anti-pollutant soldering iron protects workers against pollutant residual vapors resulting from soldering by operating an air moving fan, or the like, to create a suction air stream in a housing which guides pollutant residues trapped therein to and through a retaining filter and then directs the filtered air to the atmosphere. The air moving fan, or the like, may also be reversed to force the residual vapors away from the soldering iron.

Abstract: Low intensity laser oscillators produce precisely located beams on each side of the net detected by laser receivers on the opposite end of the net along with appropriate electronics to monitor and announce each time that the served balls intercept the beams and cause the laser beams to not be detected by the appropriate receiver.

Abstract: The optical line watchers continuously monitor the out areas along the court lines, selectively capture the images when the ball touches the watched areas, and convert optical information into electrical pulses of current, which properly selected and amplified, produce audio and video announcements.