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web |
https://en.wikipedia.org/wiki/Sergey_Prokudin-Gorsky
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83177 |
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web |
http://www.loc.gov/pictures/collection/prok/
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83176 |
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web |
http://fenyregesz.hu/2018/01/23/szines-mult-1-resz-carsag/
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83175 |
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web |
http://www.migavia.com/engineers/nadashkevich.html
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83174 |
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web |
https://en.wikipedia.org/wiki/Hellschreiber
|
83170 |
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web |
https://www.ha5kdr.hu/2017/01/egy-kulonleges-masina-a-htg-1-hellschreiber-ado-vevo
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83169 |
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| |
web |
https://www.cryptomuseum.com/telex/hell/index.htm
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83168 |
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| |
web |
https://www.nonstopsystems.com/radio/hellschreiber.htm
|
83167 |
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| |
web |
https://www.ham.hu/radiosatvitel/szoveg/Hell/
|
83166 |
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| |
web |
http://www.gyges.dk/luftwaffe_bernhard.htm
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83164 |
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