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History of the manufacturer  

Nanjing 南京工学院无线电厂 Nanjing Engineering Faculty Radio Factory; Nanjing

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Name: Nanjing 南京工学院无线电厂 Nanjing Engineering Faculty Radio Factory; Nanjing    (PRC)  
Abbreviation: nanjingEng
Products: Model types
Summary:

Nanjing Engineering Faculty Radio Factory; Nanjing 南京工学院无线电厂: Brands: 5.7.

History:

Nanjing Engineering Faculty Radio Factory; Nanjing 南京工学院无线电厂:

南京 Nanjing is the capital of Jiangsu province (Kiangsu) 江苏 in simplified Chinese - in southeast China, abbreviation 蘇|苏, Mandarin Jiāng​sū and traditional Chinese ​江蘇.

Brands:
"5.7" = "The 7th of May". For instance the early transistor radio "5.7"-301. We don't know if that has to do with the 7th of May, when the troops of general Christian De Castries were destroyed and demoralized in the French War of Indochina - or with something else.


Some models:
Country Year Name 1st Tube Notes
PRC  66 5.7 The 7th of May 301 3AG51  The brand of this radio is 5.7 which corresponds to "The 7th of May". Jingtiguan Shouyinji... 
PRC  66 WuQi 5.7 -2 3AG1D  The radio model WuQi 5.7-2 has broadcast (as all at that time from 535 - 1605 kHz) and SW ... 

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