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2. Laptop charging trolley - Wikipedia

   en.wikipedia.org/wiki/Laptop_charging_trolley

   Laptop charging trolleys, also known as laptop trolleys or laptop carts, are mobile storage containers to charge laptops, netbooks and tablet computers en masse. The trolleys are predominantly used in schools that have replaced their traditional static ICT [ 1 ] suites of desktop computers with laptops, but do not have enough plug sockets in ...

3. Roll-away computer - Wikipedia

   en.wikipedia.org/wiki/Roll-away_computer

   Since its announcement, the roll-away computer has remained a theoretical device. A roll-away computer is a computer with a flexible polymer-based display technology, measuring 1 mm thick and weighing around 200 grams. [citation needed] Flexible and rollable displays started entering the market in 2006 (see electronic paper).

4. ROM cartridge - Wikipedia

   en.wikipedia.org/wiki/ROM_cartridge

   A Star Raiders ROM cartridge for an Atari computer. A ROM cartridge, usually referred to in context simply as a cartridge, cart, cassette, or card, is a replaceable part designed to be connected to a consumer electronics device such as a home computer, video game console or, to a lesser extent, electronic musical instruments.

5. Elevator - Wikipedia

   en.wikipedia.org/wiki/Elevator

   In the past, elevator drive mechanisms were powered by steam and water hydraulic pistons or by hand. In a "traction" elevator, cars are pulled up by means of rolling steel ropes over a deeply grooved pulley, commonly called a sheave in the industry. The weight of the car is balanced by a counterweight. Oftentimes two elevators (or sometimes ...