Abstract: A foldable cleaning implement is foldable into a compact form for ease in transporting and storing. The cleaning implement has a handle and a head. The handle may be formed from a plurality of segments coupled together by foldable elements. The head is attached to the handle, preferably by a pivotable or universal joint, and is formed from segments which are displaceable relative to one another so as to selectively be oriented in a coplanar relationship relative to one another, angular disposed relative to one another, and in opposing directions relative to one another.

Abstract: An amplifier, suitable for use in a limited band at microwave frequencies, incorporates a single lossless feedback coupling element between the input port and output port of the gain circuitry. The feedback element is formed of two coextending conductors of a length on the order of a quarter wavelength of the center frequency of the band. An input signal is coupled to the gain element through one of the feedback conductors. An output signal is coupled from the output port of the gain element through the other of the conductors of the feedback element. Relatively low closed loop gain, on the order of 10 dB, is achievable over the specified band at center frequencies on the order of 800-1000 MHz.