In a shaft seal part structure of a hydraulic shock absorber, a diameter of an upper portion of the outer cylinder is reduced toward the tubular portion of the oil seal, and the diameter reduced portion of the outer cylinder presses the tubular portion of the oil seal downward, thereby holding the inner cylinder, the rod guide and the oil seal in an inner portion of the outer cylinder. The progress in broadcasting the web content information over one or more transports and over one or more channels within those transports, may be monitored to provide a time based indication of what content has been broadcast. Multiple nozzles at respective multiple physical locations are preferably controlled by a single control unit, so they can be synchronized to maintain a common target point on a cutting tool, even if the nozzles are located asymmetrically or non-uniformly with respect to the spindle axis or target point. Expansion of the bodies form cavity or cavities in cancellous bone in the interior bone volume. According to various examples, system architectures are described for facilitating video collaboration. The three motorgenerators are operable in a coordinated fashion to yield an EVT with a continuously variable range of speeds.