Italiano: Zipperlen & Co, petroleum drilling in the valley of the Chero near Velleia (Veleia, Carpaneto Piacentino, Piacenza, Emilia-Romagna, Italy) in Sir Boverton Redwood 'Petroleum a treatise on the geographical distribution' of 1922

Towards the end of the last century considerable activity was shown by Zipperlcn & Co., in drilling in the valley of the Chero, near Velleia. In this company's report for the year 1892, published in the Paris L'Argus, it is stated that the production of petroleum from the company's wells, which was 928,000 kilos, in 1891, had increased in 1892 to 2,391,666 kilos. There were seventeen productive wells, and six more in course of drilling. A Decauville railway had been laid to the wells, and telephonic Communications had been established, by means of a line 8 kilometres in length, between Velleia and the furthest point on the concession, where the pipe-line delivered the petroleum from the wells on to the Chero. In 1893 the production of petroleum had increased to 2,648,803 kilos., the smallness of the increase, as compared with that of the previous year, being ascribed to the exploiting of a new zone. Four new wells were in course of drilling.