you can usually find a great deal of information online using a search
engine. Or going to your local library and look for books about buttons.
Unfortunetely there is no easy way to know without doing the research.
Hi, I just wanted to let you know about a group on google called
ButtonBytes. You have to sign up at
http://www.buttonbytes@googlegroups.com. The people there are all very
knowledgeable about buttons. Most are members of National and State
button soc...