Well that's what I would think.  Like on Vienna sausage cans, etc...all
made during 'modern' times.  I didn't know non-aluminum pull tabs were
even made.  
But...apparently so....even today...on Swanson's chicken broth cans...or
so I'm told (a magnet sticks to them).

-----Original Message-----
From: HISTORICAL ARCHAEOLOGY [mailto:[log in to unmask]] On Behalf Of
Richard Wright
Sent: Monday, July 21, 2008 4:46 PM
To: [log in to unmask]
Subject: Re: Ring-Pulls on Food Cans

The page at

http://web.mit.edu/invent/iow/fraze.html

implies that your ring pull is more recent than 1959.

Richard