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Резюме
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Тэги
патенты
патентные чертежи
патентное бюро США
Антон Шварцкопф
патентные чертежи США
изобретения
железнодорожный фотоархив
Дата
24/01/1978
Источник
USPTO
Ссылка
Информация о правах
public domain