Fig-5-6 - A drawing of two different types of electrical equipment
Резюме
Figure 5 & 6 Korndorfer Patent (1908)
Public domain photograph of electric motor, free to use, no copyright restrictions image - Picryl description
Тэги
Дата
1908
Источник
Wikimedia Commons
Ссылка
Информация о правах
public domain