Abstract: A method and apparatus for discharge blocking device compatible with a firearm having a magazine housing and a trigger bar, the discharge blocking device comprising, a cover, having a shape compatible with the magazine housing, abase, covering a locking mechanism, and a locking element, at least partially accommodated in a channel inside the cover, wherein the locking element is configured to allow movement within the channel between locked and unlocked states in order to allow blocking the trigger bar of the firearm, and wherein the locking element is at least partially accommodated inside the wall of the cover and configured to at least partially rotate between locked and unlocked states about an axis that is aligned with the longitudinal dimension of the cover, in order to allow blocking the trigger bar of the firearm with the blocking segment.

Abstract: A discharge blocking device compatible with a firearm that has a magazine housing. The safety magazine comprises a cover that has a shape compatible with the magazine housing, a base that covers a locking mechanism, and a locking element that at least partially accommodates inside the cover. The locking element is configured to allow blocking the trigger of the firearm. A method for locking a magazine to a firearm and preventing accidental discharge is disclosed. The method comprises providing a cover, that has a shape compatible with the magazine housing, providing a base, covering a locking mechanism, providing a locking element, and inserting the cover into the magazine housing, wherein the locking element is configured to allow blocking the trigger.

Abstract: A safety magazine is compatible with a firearm that has a magazine housing. The safety magazine comprises a top cover that has a shape compatible with the magazine housing, a bottom cover that covers a locking mechanism, and a top locking element that at least partially accommodates inside the top cover. The locking element is configured to allow locking the safety magazine to the magazine housing. A method for locking a magazine to a firearm and preventing accidental discharge is disclosed. The firearm has a magazine housing.

Abstract: A computing device displays electronic content associated with a plurality of annotations each corresponding to a respective portion of the electronic content. A first annotation, which includes one or more comments associated with a first portion of the electronic content, is displayed. While the first annotation is displayed, an input to display a second annotation is received. The second annotation is associated with a second portion of the electronic content, and includes one or more comments associated with the second portion. Responsive to receiving the input, the second portion of the electronic content and the one or more comments associated with the second portion are displayed.

Abstract: The present invention provides a magazine holding ammunition and electronic components arranged to be locked/unlocked biometrically or by radio signal, the magazine comprising a housing having a capacity for holding both a column of cartridges and electronic components. The housing being dimensioned to be insertable into a standard firearm without requiring any modification of the firearm. Further, the magazine includes an assembly for preventing the charging of the firearm by a mechanical element extending longitudinally outside of the housing or a cartridge barrier element preventing cartridges exiting the magazine housing; and manually or electro-mechanic actuating means for pulling/pushing the mechanical elements in response to a received radio signal, or biometrically released; and electronic means in the housing for processing incoming radio signals for actuating all means and a mobile power supply attached to the housing.

Abstract: A combined digital depth control and rate of ascent control device to be used by scuba divers. The device would automatically prevent the diver from exceeding a predetermined depth and prevent the diver from ascending at an excessively high rate. The device comprises a sealed housing attachable to the apparatus so as to be submerged in the water with the diver. The housing has an inlet connectable to the pressurized gas tank, an outlet connected to the inflatable buoyancy jacket, a control passageway between the inlet and outlet, being automatically displaced to open the passageway upon sensing the predetermined depth.

Abstract: Scuba diving apparatus includes a buoyancy compensator attachable to a diver, and a depth control device for sensing the depth of the diver and for automatically increasing the buoyancy of the buoyancy compensator when the diver is submerged at a predetermined depth in the water, to thereby prevent the diver from exceeding the predetermined depth.