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Hartmann & Braun Desconhecido 1920 - Decades Box see more

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Hartmann & Braun Desconhecido 1920 - Decades Box The test equipment, the first decade resistance boxes made of wood, had brass pins inserted into contacts that let you choose combinations of resistance values.

The brass pieces (pins or keys) were connected to coils, placed inside the wooden box.

They were the first labs and learning devices.

In 1879, Hartmann & Braun is founded in Germany.

At the end of the 19th century, it was considered a leading supplier of test instruments, strengthening its position during the 1920s, a period in which Hartmann & Braun became one of the main European suppliers of test instruments.

Also in 1920

23 of April - The Grand National Assembly of Turkey (TBMM) is founded in Ankara, Turkey. It denounces the government of Sultan Mehmed VI and announces the preparation of a temporary constitution.
10 of January - The Treaty of Versailles takes effect, officially ending World War I.
9 of February - Under the terms of the Svalbard Treaty, international diplomacy recognizes Norwegian sovereignty over Arctic archipelago Svalbard, and designates it as demilitarized.

Learn more about this decade in:

Deif 34 1960 - Electrometer see more

EMI 302 1960 - Osciloscope see more

EMT J60B 1952 - Flutter Meter see more

Excelsiorwerk Vollnetz 35A 1935 - Valve Analyzer see more

Fürstenau, Eppens & Co Desconhecido 1920 - Intensimeter see more

Gates /BW Vários 1960 - Audio Bench see more

Gaumont-Kalee 1740 1960 - Flutter Meter see more

General Radio 516-C 1932 - Radio Frequency Bridge see more

General Radio 602-K 1935 - Decades Box see more

General Radio 759 A 1936 - Sound Level Meter see more

General Radio 726 A 1936 - Voltmeter see more

General Radio 724 B 1947 - Frequency Meter see more

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