Electricity supply meter, ampere/hour and prepayment
1906
mercury motor type electricity supply meter by Ferranti
1884
ampere-hour meter by Bastian Meter Co. Ltd.
1900
Aron clock-type ampere hour meter
1898
Aron clock-type ampere hour electricity supply meter for 100 amperes
1884-1900
Mordey-Fricker type electrolytic electricity supply meter
1908-1923
