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
Interstate 70 in Maryland for the latter interchange, MD 75 was relocated east of New Market. The existing interchanges at MD 32 and MD 97 were converted from two-way connector ramps to diamond interchanges. I-70's interchange with MD 27 was expanded from a four-ramp partial cloverleaf to a six-ramp partial cloverleaf in 1977. Exit numbers were added east of Frederick in 1978; however, these exit numbers were each 2 less than the present numbers, which were marked in 1983. I-70 was relocated away from the original alignment of US 40 between its junctions with MD 144 in Frederick and Bartonsville around 1987; the old