new partners quickly realised they needed greater customer exposure, so in 1909 they moved to the city's busiest commercial street, Rundle Street. Business then began to flourish. Harold Pank married in 1910 to Johanna Hower (1878–1930), a trained nurse from Victoria, who also became active in the business in its early years. Maude Laubman began music studies at the Elder Conservatorium. In 1913 Carl was a foundation member of the South Australian Optical Association, being immediately elected to its council, a position he held for many years. Upon the outbreak of WWI in 1914, Maude Laubman's only brother, Christopher Sullivan (1886–1944), enlisted in the 10th Battalion. Due to anti-German attitudes by the public, Carl anglicised his name to Charles William Laubman, although he remained Carl to family and associates. Having dropped the last letter from his surname, the business now became Laubman & Pank. Diversifying from just being opticians, they also traded in all manner of optical instruments. Their field glasses were popular as parting gifts to military officers. Always experimenting, the men invented and developed several important optical instruments, lenses, and processes, for which patents were granted both in Australia and overseas. In 1927 the now prosperous partners undertook a world trip, visiting many of the famous optical manufacturers throughout Britain, Europe and the United States. In Germany they visited scientist Albert Einstein, personally delivering a report of observations from the South Australian Government Astronomer concerning the theory of relativity. In 1926 Carl employed his 14-year-old nephew by his sister Charlotte, Donald Herbert Schultz (1912–1987), as an apprentice. In 1930 Johanna Pank died. By that year, with staff totalling over fifty, Laubman & Pank had become pioneers in itinerant optometry, visiting rural and regional areas of South Australia, far western NSW, and western Victoria. In pursuit of their creed of customer service, no place was too remote for their opticians to visit. In 1933 they purchased their own four-storey commercial premises in Gawler Place, Adelaide. In 1934 Harold Pank's 17-year-old son, David Leon Pank AM AFC (1917–2004), joined the business. By the 1920s and 30s Mr and Mrs Laubman were active participants in Adelaide's social and arts scene, sponsoring, among other things, the Laubman and Pank Gallery. Harold Pank died in 1935, the same year that a branch office was opened in Broken Hill. Carl Laubman then became sole proprietor until a company was formed in 1937, of which