sedraselections: 1963-(via File Photo) by File Photo on Flickr.
monkeyday41.tumblr.com/post/79140644759/
monkeyday41.tumblr.com/post/79141330994/
Michèle Mercier
Electronics World Hi-Fi Annual & Audio Handbook, 1960
monkeyday41.tumblr.com/post/79141857024/