as for EGO type
batteries? yes they are all copies, but in many cases they work just as well.
the original EGO battery was Invented by Ovale and manufactured by joyetech in a cross license agreement, so either of those brands would be originals. The ego battery was named for the outside EGO cone threads.
as for everything else. hmm lots of stories there.... the original mods were flashlight tubes .
Kanger invented the 808d cigalike batteries (V2 Blu etc)
and joyetech brought the 510 cigalike to market
People got tired of these little batteries and started making homemade versions with replacable batteries and the term mod was invented and stuck, most mods should actually be called advanced personal vaporizers.
one of the first production VV mods was the buzzpro and lavatube
one of the first production mechanicals was the infamous silver bullet.
about 2 years ago the ego became the defacto standard. as they offered 2 different connections and that meant you could use a ton of devices.
about a year and a 1/2 the ego VV or twist hit the market and really changed everything.
after many attempts with other things it wasnt until the twist came out that I was finally able to enjoy
vaping and completely quit smoking.