human life <> technology generation

I recently experienced the technology of receiving the "bar coded boarding pass" on my cell phone, via e-mail, which I could just swipe prior to boarding the aircraft (no paper whatsoever!). This led me to think about the advancements in technology during my lifetime and how we see multiple generations of it in one lifetime of ours - the quartet below is a tribute to that!

When the telegram gave way to the letter,
Communications surely changed for ever;
Just when you thought it couldn't get any better,
Began the era of e-mail on the computer!

Televisions evolved from Black and White to color,
Transformation in displays was much sooner;
Looking beyond the question of projection or plasma,
Began the era of the LCD charisma!

Reading used to be on the old styled book,
Carried it around every corner and nook;
To prevent a pile up that needed a ladder,
Began the era of the e-book reader!

Calls over the wired phone began with the trunk kind,
Slowly and surely happened the liberation of the bind;
Trying to come up with an all-in-one solution,
Began the era of the mobile revolution!