I was perusing the websites of several rarely mentioned speaker manufacturers, and was wondering... anyone know why Coincident Speakers would have a patent number on the bottom of the page describing their basic speaker design principles that refers to a 1938 application for a fruit pitting machine? 
Seriously... could this be reference to a Canadian patent number? I've only searched the USPTO site in the past, and didn't know if Canadian companies would use US patents, international patents, Canadian patents, etc. Just curious.
Seriously... could this be reference to a Canadian patent number? I've only searched the USPTO site in the past, and didn't know if Canadian companies would use US patents, international patents, Canadian patents, etc. Just curious.