Abstract: The dust attachment which is used with a spiral saw power tool includes a first attachment portion which at a rear end has a substantially dust-tight fit with a mounting head portion of the tool. The other (forward) end extends beyond a forward edge of the mounting head portion, but such that the spiral saw bit extends beyond the forward edge of the attachment portion by a distance which is slightly greater than that of the thickness of the workpiece. An attaching member such as a screw secures the dust attachment portion to the tool. An dust exit tube extends from a side surface of the attachment portion and communicates with the interior of the attachment portion. The dust exit tube extends at an angle away from the attachment portion toward the rear end thereof.

Abstract: In the illustrative embodiment, a one shot multivibrator is adapted to receive an incoming FM signal at its input, and in operation generates a series of pulses which coincide in time with the positive peaks of the received FM signal. The series of pulses generated by the multivibrator is in turn applied to an initiate/reset input of a free-running pulse generator which is arranged so that, when it is permitted to free-run, it emits a train of pulses having a preset pulse interval identical to the interval between successive positive peaks of the incoming FM signal at the particular point in time when the instantaneous voltage level of the modulating signal component of the FM signal is equal to the predetermined voltage level.