Anyone seen this light

cmb56

Member
May 22, 2010
746
Norrköping, Sweden
The patent was filed in 1952 and granted in 1956 but the ad is from 1953 which is a proof of that manufacturers started to sell products prior approval.
At least in this case but I think most manufacturers did so.

Michael
 

stansdds

Member
May 25, 2010
3,538
U.S.A., Virginia
The patent was filed in 1952 and granted in 1956 but the ad is from 1953 which is a proof of that manufacturers started to sell products prior approval.
At least in this case but I think most manufacturers did so.

Michael
Quite a common practice, hence many products get released with the phrase "patent pending" attached to them.
 

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