Hover your mouse over the button images below to see the
back of the button and the back marks.
You may click on the Patent thumbnails below to see the full U.S. Patent office copy of the patent.
Close the expanded view patent window to return to this page.
The button to the left is the same as
the button immediately above it.
The only difference is that the one
on the left was photographed with
a high intensity light (not a black light)
behind the button, demonstrating that
black glass buttons are not truly black!
Red is not the only color that may be
observed with a bright light.