View Single Post
Old September 10, 2007, 07:39 PM   #4
Junior Member
Join Date: April 1, 2007
Posts: 10
Up until a certain date, not sure exaclty when, but seems it was around 1910/1920, the patent dates for all applicable (claimed applicable, anyway) patents had to be on the item, or they were not covered.
toolman846 is offline  
Page generated in 0.03940 seconds with 7 queries