Abstract: A tool is described that reduces very substantially the difficulties previously encountered in dismantling sectioned communications towers. In preferred embodiments the tool also can be used to facilitate erection of such towers. The tool comprises a leverage bar and an articulated arm affixed to depend at an angle from, and to serve as a fulcrum for, the leverage bar. The articulated arm comprises two segments. The first segment is affixed to the leverage bar intermediate the ends thereof and depends therefrom at an angle, preferably about 90.degree.. In addition, the first segment is stationary relative to the leverage bar and is positioned closer to the front end thereof. The second segment is pivotally connected to the first segment close to the free end thereof so that the second segment is rotatable through an arc aligned in substantially the same plane as the plane occupied by the leverage bar.

Abstract: Modulators for producing a composite video signal comprising composite video color bars of one volt, peak to peak, of the United States NTSC standard type, are described. The modulators include an EPROM matrix coupled to receive the outputs from a video graphics circuit and programed to produce the color bars from such outputs. The modulator also has a decoder interposed between a loop returning the output from the EPROM matrix to the video graphics circuit and thence to an output driver producing an output of color bars at one volt peak to peak into a 75 ohm load.