Abstract: A paint film structure formed on an aluminum member or aluminum alloy member has a first paint film layer formed on a surface of the aluminum member or aluminum alloy member and a second paint film layer formed on a surface of the first paint film layer, the first and second paint film layers being chiefly composed of a colloidal silica, an organoalkoxysilane part hydrolysis condensation product, and a polymer or copolymer of an unsaturated ethylenic monomer, polymeric content or copolymeric content of the unsaturated ethylenic monomer in the first paint film layer being less than polymeric content or copolymeric content of the unsaturated ethylenic monomer in the second paint film layer.

Abstract: A small-sized differential piston unit is disclosed. The piston unit has a cylinder filled with liquid medium and a piston slideably mounted in the cylinder. An operation rod is operatively connected to said piston. An improved sealing member consisting of a membrane is used to completely seal the liquid medium in the cylinder. Control means is provided for imparting fluid resistance caused by the liquid medium to the piston differently between its forward movement and backward movement in the cylinder.

Abstract: An automatic cartridge ejecting apparatus for magnetic tape player is provided. The apparatus comprises an eject lever for ejecting the cartridge from the tape player and an electromagnetic latch device adapted to latch the eject lever in a depressed position. The latch device comprises a movable member operatively connected to the eject lever, a magnet and a ferromagnetic lever pivotally connected to the movable member and being engageable with the magnet when the eject lever is in the depressed position. The ferromagnetic lever is configured to provide a mechanical advantage to the magnet for holding the eject lever in the depressed position.

Abstract: A latch device latches a fast forward button when the same is depressed. A sensor releases the latch device and thereby the fast forward button upon sensing a blank area on a magnetic tape. The latch device comprises a ferromagnetic lever which is pivotally connected to the fast forward button and is engageable with a magnet when the fast forward button is in the depressed position. The lever is configured to provide a mechanical advantage for holding the fast forward button in the depressed position. The magnet may be an electromagnet which is de-energized when the sensor senses the blank area on the tape. Alternatively, the magnet may be a permanent magnet and an electromagnet provided to neutralize the force of the permanent magnet on the lever when the electromagnet is energized.