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When were tifocals invented?
bifocals in 1884, but trifocals were in the 40's1 year ago
When was the trifocals invented?
John Isaac Hawkins, the inventor of trifocal lenses, coined the term bifocals in 1824 and credited Dr. Franklin.
What is lenticular spectacle lenses are they better than trifocals?
Varifocals
Why have trifocal lenses never been popular in the UK?
Trifocals are not popular in UK because people are using progressives lenses. I am wearing trifocal since I am 50 years old and my vision is quite better compare to when I was wearing progressives lenses. Tim.
Who invented the abacus when it was invented why it was invented and who invented it?
jv
When was the CD player invented and who invented it?
The CD was invented in 2001 Thomas clamps invented it.
When invented resistor?
invented in 500BC before electricity was invented
When was the phone chargers invented?
Gloria Mejia invented it and she invented it in 1998
When was snickerdoodles invented and where?
When and where were snickerdoodles invented Why were snickerdoodles invented
When was the washboard invented?
who invented the washboard?
Is the computer invented or not?
Yes, the computer is invented.
What is the past participle of invented?
Invented is the past participle of the verb invent. verb /past /past participle = invent /invented /invented
