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90 years of tube porn?

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I was given a grubby but serviceable copy the 1933 RCA-Cunningham radio tube manual (RC-11) and was quite looking forward to browsing it. And then I looked at the back cover and saw the distinctly phallic arrangement of valve-and-trademarks surmounting the National Recovery Administration logo and motto: "We Do Our Part".

Now I'm nervous about what RCA-Cunningham might have meant by "doing their part" and what I might find between the covers - surely not a centrefold? :yikes:
 

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Designers of books from long ago clearly believed that they could get away with anything in this category.

Take for instance the Encyclopædia Britannica ("Scholar's Edition" = ninth edition, late 19th century).

The decoration on the spine appears to be a fine ornate phallic 'Triumphal Arch'. (Triumphallic Arch, perhaps

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