Fuentes consultadas1. WWW SPP, 16/06/2016 http://www.spppumps.com/about-us/history/
2. WWW Wikipedia, 16/06/2016 Pulsometer Engineering Company Limited was founded in Britain in 1875 after a British engineer bought the patent rights of the pulsometer pump from Thomas Hall. In 1961 Pulsometer merged with Sigmund Pumps of Gateshead to form Sigmund Pulsometer Pumps (SPP). SPP Ltd is now part of Kirloskar Brothers Ltd. https://en.wikipedia.org/wiki/Pulsometer_pump