Telephone switchboard, c. 1949, Western Electric - Museum of Science and Industry (Chicago) - DSC06823.JPG
Daderot
en
Telephone switchboard, c. 1949, Western Electric Museum of Science and Industry (Chicago) DSC06823, Exhibit in the Museum of Science and Industry, Chicago, Illinois, USA. Photography was permitted in the museum without restriction.
commons
en
Telephone switchboard, c. 1949, Western Electric Museum of Science and Industry (Chicago) DSC06823, Western Electric switchboards, Telephones in the Museum of Science and Industry (Chicago)
commons
ja
電話交換機、1949年頃、米国シカゴ科学産業博物館の展示。写真は美術館で制限なく許可された。
commons_translated
ja
電話交換機、1949年頃、ウェスタン・エレクトリック科学産業博物館。
commons_translated
electric switchboard switchboard control panel