Here's one clever advertising contraption "actuated by the opening and closing of the [glass] door to attract the attention of the person entering.
In order, however, to attract the attention of those who might not be attracted by the rising of the card, I provide a sounding device."
Patent #715886 awarded in 1902.
No comments:
Post a Comment
I am moderating all comments to weed out spam (there's a lot of it). Comments are usually approved within a day.