Expositions have traditionally featured the latest contraptions. This is a souvenir card from the Dictaphone exhibit at the 1933 Century of Progress Exposition in Chicago. The souvenir is printed on both sides of a card that folds in the middle. One half has a detachable postcard that you could "mail to your friends as a souvenir of your visit to A Century of Progress."
According to the information on the card, the exhibit featured "the new Model 12, the new Dictaphone Cabinet, the original Tainter model, and practical demonstrations of office efficiency and economy." (Tainter was an inventor involved with others, including Alexander Graham Bell, in developing the first Dictaphone.) The Model 12 was said to be "compact"in 1933, but it looks monstrous by today's standards.
The Dictaphone's earliest development occurred at the Volta Laboratory established by Alexander Graham Bell in Washington, D.C. in 1881 (Wikipedia). Dictaphones used wax cylinders for voice recording until after WWII. Needless to say, there have many advances in voice recording and transcription in the 80 years since A Century of Progress. There is even an app for that.
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