June 20
1877 – Alexander Graham Bell installs the world's first commercial telephone service in Hamilton, Ontario , Canada. 1887 – Victoria Terminus , the busiest railway station in India, opens in Bombay . Birthday of Sir Frederick Gowland Hopkins Sir Frederick Gowland Hopkins (20 June 1861 – 16 May 1947) was an English biochemist who was awarded the Nobel Prize in Physiology or Medicine in 1929, with Christiaan Eijkman , for the discovery of vitamins . He also discovered the amino acid tryptophan , in 1901. He was President of the Royal Society from 1930 to 1935. Birthday of Laxmanrao Kashinath Kirloskar Laxmanrao Kashinath Kirloskar (1869-1956) was an Indian businessman . He was the founder of the Kirloskar Group .