Abstract: A robotic work tool system (200) comprising a robotic work tool (100), the robotic work tool (100) being configured to determine (410) that the robotic work tool (100) has entered a state of limited movement; determine (420) an exit path; and exit (430) the state of limited movement by navigating the exit path.

Abstract: An electronic combination lock includes a door handle having a code entry button and housing a lock assembly and an electrical circuit. The lock assembly includes a lock body, a rotating cylinder, spring loaded lift lock pins and corresponding key pins, a reset cam path and a programming cam path formed on the cylinder, a lift comb for lifting the lift lock pins, a latch for latching the lift comb and a magnet being selectively activated to cause the latch to release the lift comb. The electrical circuit receives a first input signal indicative of an input code entered at the code entry button and a second input signal from a program switch actuated by the programming cam path and is operated to store an entry code when the program switch is actuated and to activate the magnet when an input code matching the stored entry code is received.

Abstract: An electronic combination lock includes a door handle having a code entry button and housing a lock assembly and an electrical circuit. The lock assembly includes a lock body, a rotating cylinder, spring loaded lift lock pins and corresponding key pins, a reset cam path and a programming cam path formed on the cylinder, a lift comb for lifting the lift lock pins, a latch for latching the lift comb and a magnet being selectively activated to cause the latch to release the lift comb. The electrical circuit receives a first input signal indicative of an input code entered at the code entry button and a second input signal from a program switch actuated by the programming cam path and is operated to store an entry code when the program switch is actuated and to activate the magnet when an input code matching the stored entry code is received.

Abstract: An installation for storing of natural gas or some other fluid comprises a lined underground storage space. Inside the rock wall of the storage space, there is a concrete layer for supporting an inner impermeable lining layer. According to the invention, the concrete layer has a crack distribution control reinforcement layer closer to the impermeable lining layer than to the rock wall in order to divide large cracks in to smaller cracks and to distribute the cracks over a larger area of the impermeable lining layer. Also according to the invention, there is provided between the impermeable lining layer and the concrete layer a non-binding sliding layer to facilitate relative movements between the impermeable lining layer and the concrete layer.

Abstract: An installation for storing of natural gas or some other fluid comprises a lined underground storage space. Inside the rock wall of the storage space there is a concrete layer for supporting an inner impermeable lining layer. According to the invention, the concrete layer has a crack distribution control reinforcement layer closer to the impermeable lining layer than to the rock wall in order to divide large cracks into smaller cracks and distribute the cracks over a larger area of the impermeable lining layer. Further, also according to the invention, there is between the impermeable lining layer and the concrete layer a non-binding sliding layer to facilitate relative movements between the impermeable lining layer and the concrete layer.