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2. Mechanically powered flashlight - Wikipedia

   en.wikipedia.org/wiki/Mechanically_powered...

   The best designs use a supercapacitor instead of a rechargeable battery, since these have a longer working life than a battery. This, along with the long-life light-emitting diode which does not burn out like an incandescent bulb, give the flashlight a long lifetime, making it a useful emergency light. A disadvantage of many current models is ...

3. Calculator Here We GO! - Wikipedia

   en.wikipedia.org/wiki/Calculator_Here_We_GO!

   By 1970, a calculator could be made using just a few chips of low power consumption, allowing portable models powered from rechargeable batteries. The first handheld calculator was a 1967 prototype called Cal Tech, whose development was led by Jack Kilby at Texas Instruments in a research project to produce a portable calculator. It could add ...

4. Latil KTL - Wikipedia

   en.wikipedia.org/wiki/Latil_KTL

   Le tracteur routier type 'KTL' à quatre roues motrices et directrices [The KTL road-going light tractor with four-wheel drive and steering] (in French), Suresnes: Latil, 1934 "New additions to the range of Latil chassis". The Commercial Motor. Vol. 50, no. 1282. London: Temple Press. 1929. ISSN 0010-3063. "Three days' work with a Latil tractor".

5. 35 of the very best outdoorsy gifts for hikers, hunters and ...

   www.aol.com/lifestyle/best-outdoorsy-gifts-for...

   This No. 1 bestseller comes with a 20-volt rechargeable lithium battery for cord-free convenience. "Excellent tool for small to medium tree and shrub trimming!" raved one reviewer .

6. Flashlight - Wikipedia

   en.wikipedia.org/wiki/Flashlight

   The first mass-produced dry cell batteries came in 1896, and the invention of portable electric lights soon followed. Portable hand-held electric lights offered advantages in convenience and safety over (combustion) torches, candles and lanterns. The electric lamp was odorless, smokeless, and emitted less heat than combustion-powered lighting.

7. Light-emitting diode - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode

   One-color light is well suited for traffic lights and signals, exit signs, emergency vehicle lighting, ships' navigation lights, and LED-based Christmas lights Because of their long life, fast switching times, and visibility in broad daylight due to their high output and focus, LEDs have been used in automotive brake lights and turn signals.