A propeller control system includes a propeller control logic subsystem in conjunction with an engine control logic subsystem to provide an optimized transition from forward to reverse speed governing under all operating conditions. A device mounting member of a rotatable chuck is supported for rotation on a first surface of a base until a vacuum is applied drawing the device mounting member into contact with a second surface of the base and constraining the device mounting member against rotation. The body portion has an attachment ledge section and the crown portion has attachment section that overlays the attachment section of the body. an optical communication system, in an optical fiber laser, in an optical fiber amplifier, in an optical fiber Raman amplifier, in a dispersion compensator, in a dispersion andor dispersion slope compensator. The calendar coordinator is provided for coordinating the standard calendar manager and the business calendar manager to indicate a selected date on the standard calendar and the business calendar.