What was introduced into the Emerson OSCILLATING table fans in 1927? The patent for it was FILED in Sept. 27, yet there is paper proof it was introduced in 27. What was it?
There is a Emerson advertisement sporting the use of the patented lubricating device below in 27. The patent was issued in 30. So it must of been a practice at times?..to have doo dabs and products on the market at the time of their patent filing date.
