Science and invention in Birmingham pen nibs per week. 1915: William Mills develops the first "safe grenade" meaning it is safe for the soldier throwing it rather than his opponent. It is named the Mills bomb, and is adopted by the British Army as its standard hand grenade in 1915. 75,000,000 grenades are supplied during The Great War. 1918: Much work is carried out by Oliver Lucas's company on the design and improvement of the military search light, he also designs a signalling lamp after experiences at the Somme and the design is later used by the British Army. 1920: Charles Henry Foyle invents the
Telephone numbers in Brazil first years, then eight digits became the standard for several years. The last area code to convert fully from seven to eight digits was "61" (comprising the national capital city, Brasília, and neighbouring areas), in 2005. However, the popularity of multiple-SIM mobile phones in Brazil makes the country have more active mobile lines than inhabitants (as of November 2016, 248 million vs. 206 million), and by 2010 the country's most populous and economically important area code, "11" of metropolitan São Paulo (an area where over 20 million people live), was getting close to exhausting its available mobile numbers. Overlays and