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WE640aaAD1.jpg
Advertisement for the Western Electric 640AA Condenser microphone and RA-1095 Amplifier.

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http://plus.pointblankmusicschool.com/wp-content/uploads/2013/10/cardoid-pattern1.jpg

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https://holdforsound.files.wordpress.com/2017/03/electro_voice_model_6431-7303cb12a54c5c3c92eaeb781b15a910.jpeg
Advertisement for the Electro-Voice 643, a unidirectional shotgun microphone.

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shotgunmicpatent.png
Diagram of a unidirectional microphone from the first patent for such a microphone, patented in 1963.

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