Graetz AG

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Graetz AG (formerly Ehrich & Graetz AG) was a German manufacturer of petrol lamps. In 1899 the company began to produce radio sets at its plant in Berlin-Treptow. The company lent its name to an electrical circuit called the Graetz bridge, which is better known as the full-wave bridge rectifier. A drawing of this circuit attributed to Graetz, dated 1897, appears in a paper by Chattopadhyay.

Reference

• [Ralf's Antique Radio Homepage (in German)]

 

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