Oppenheimer & Co. was a prominent supplier of water infrastructure in Melbourne during the 1860s, including Siemens patent water meters, brass taps, hydrants, and valves. They operated from 42 Collins Street East in 1863 and later moved to 106 Collins Street West. Historical Profile: Founded by Joseph Oppenheimer, the firm was active in Melbourne’s water infrastructure trade during the mid-19th century. 1863 Address: 42 Collins Street East, Melbourne — confirmed by the advertisement you provided. Products Offered: Siemens patent water meters, Brass taps, hydrants, fire-plugs, valves, Galvanized iron piping, lead pipes, and fittings Later Location (c. 1870): 106 Collins Street West, between King and William Streets. A photo from the Royal Historical Society of Victoria shows their signage and building façade. By 1874, the business was taken over by J. Slater, continuing similar trade. Siemens patent water meters were among the earliest precision flow measurement devices available in colonial Australia, likely imported from Europe. Oppenheimer & Co. appears to have been a supplier/distributor, not a manufacturer. Their presence in advertising sections of major newspapers like The Argus suggests they were well-established and targeting municipal or commercial clients.