If you are the type of individual who has a lot of spare time and enjoys doing patent searches, here are a few tips to assist you ...
The following is a "class" number for period cigarette lighters ...
F23Q2/00
(Just copy/paste it into the search box)
Regarding patent numbers themselves, the 1920s numbers are typically in this range ...
1,350,000
So all you have to do after accessing a patent website, is to enter the class number in the search box first, followed by opening the individual patent numbers that come up. But be prepared for hundreds of them. That's why I suggest focusing on the 1920s numbers ... which will be lower for earlier dates, and higher for later dates. If you have never attempted this before, give it a shot. It's defintiely time consuming, but it can also be a lot of fun, especially if you find the exact item you are looking for.
I'm searching too, but almost ready to call it quits. Two hours is about my limit!
To get you started, here is the link to a recommended patent search site ...
Link:
http://www.freepatentsonline.com/
Good luck!
SBB
P.S. ... After you click on the selected patent ~ Scroll down to where it says ...
View Patent Images: Download PDF ...
And then click on the PDF number to the right.
Double back click to return to the list