A device for controlling access to a firearm having a barrel with various physical features proximal thereto, including a muzzle device. The device includes a lock housing with a cavity to receive the barrel. The device also includes a lock mechanism shaft coupled to a lock mechanism that is configured for rotational movement upon actuation of the lock mechanism. The lock mechanism shaft is coupled to a cam that moves axially upon rotation of the lock mechanism shaft. A bidirectional rotatable shaft is coupled to the cam and is insertable into the barrel of the firearm. Embodiments described include variants on the use of a plurality of tabs such as arm, tab, and/or housing configurations to receive and grasp the muzzle device, firearm fixed front sights, bead front sights and/or accessories such as, for example, Picatinny rails, vertical or near vertical serrations, cuts and/or grooves located on the distal lateral and ventral regions of the frame and/or slide.

A precious alloy for horological applications contains by mass, in parts per thousand of the total, 540 to 630 parts of gold, 150 to 220 parts of palladium, 100 to 265 parts of silver, more than 150 to 265 parts of copper, from 0.0 to 0.2 parts of iridium, 0.0 to 4.0 parts of zinc, and the remainder containing iron and/or nickel and/or cobalt. The proportion by mass of the total content of gold, palladium, silver, copper, iridium and zinc is greater than 999.900 parts, the proportion by mass of the remainder is less than 0.100 parts. The density of the alloy includes between 13.5 and 14.5 g/cm.sup.3. The proportion by mass of cobalt is less than 0.005 parts, that of iron is less than 0.005 parts, and that of nickel is less than 0.0005 parts. The total of copper and zinc includes between 150 and 270 parts.

A precious alloy for horological applications contains by mass, in parts per thousand of the total, 540 to 630 parts of gold, 150 to 220 parts of palladium, 100 to 265 parts of silver, more than 150 to 265 parts of copper, from 0.0 to 0.2 parts of iridium, 0.0 to 4.0 parts of zinc, and the remainder containing iron and/or nickel and/or cobalt. The proportion by mass of the total content of gold, palladium, silver, copper, iridium and zinc is greater than 999.900 parts, the proportion by mass of the remainder is less than 0.100 parts. The density of the alloy includes between 13.5 and 14.5 g/cm.sup.3. The proportion by mass of cobalt is less than 0.005 parts, that of iron is less than 0.005 parts, and that of nickel is less than 0.0005 parts. The total of copper and zinc includes between 150 and 270 parts.

The invention concerns a method for unlocking a function of a device using a timepiece, the timepiece including: a display device including display elements; control means able to drive the display elements in a predefined animation sequence; the method including the following steps: the timepiece is placed in front of detection means; the control means are actuated so that they drive the display elements in the predefined animation sequence; the predefined animation sequence is detected by the detection means; the detected animation sequence is compared to a reference animation sequence; if the detected animation sequence is identical to the reference animation sequence, then the function is unlocked.

Embodiments of a watch can include a watch having an analog watch face, a first watch band portion, a second watch band portion and an analog watch face. The watch can include a butterfly clasp having a digital display and a circuit board associated with a controller.

Embodiments of a watch can include a watch having an analog watch face, a first watch band portion, a second watch band portion and an analog watch face. The watch can include a butterfly clasp having a digital display and a circuit board associated with a controller.

A wearable electronic display system detects aircraft flight related conditions, compares the detected flight related conditions with rules or procedures, retrieves flight condition information relating to phase of flight, and displays small amounts of contextually relevant flight condition information on a display screen.

A wearable electronic display system detects aircraft flight related conditions, compares the detected flight related conditions with rules or procedures, retrieves flight condition information relating to phase of flight, and displays small amounts of contextually relevant flight condition information on a display screen.

Embodiments of a digital clasp for a watch can include a watch having an analog watch face, a first watch band portion, a second watch band portion and an analog watch face. The digital clasp can include a clasp housing that includes a latch assembly configured for attachment to the first band portion and the second band portion, a digital display, and a circuit board associated with a controller.

Embodiments of a digital clasp for a watch can include a watch having an analog watch face, a first watch band portion, a second watch band portion and an analog watch face. The digital clasp can include a clasp housing that includes a latch assembly configured for attachment to the first band portion and the second band portion, a digital display, and a circuit board associated with a controller.