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How were bifocals made?

they were made out of metal


How made bifocals?

they were made out of metal


When were bifocals made and how long they were made?

1783 and was made until now


undefined what are Benjamin Franklin's accomplishments?

He did the following Invented the lightning rod He made the first political cartoon He created bifocals He was the first US Post Master General Hope this helps


Where and when were the bifocals invented?

ben Franklin invented his bifocals at his house in philly and made them on March 23.1784


What is a sentence with the word bifocals in it?

Please help me find my bifocals.


Benjamin Franklin did what?

Many things. He made the first public library, fire company, hospital, bifocals, lightning rod, odometer, fireplace, battery, and much more.


What are facts about bifocals?

they were made in 1784 he didnt actuallly counstruct it a man in France or London did it for him


Why are bifocals important?

because bifocals are still used today and without bifocals you would have to have 2 pairs of glasses that's why its Important


What are some changes of bifocals?

bifocals changed in size, shape, and magnification.


What are glasses that can focus at two different lengths called?

Bifocals.


What did benjamen invent?

* lightning rod * Franklin stove * odometer * bifocals* lightning rod * Franklin stove * odometer * bifocals* lightning rod * Franklin stove * odometer * bifocals* lightning rod * Franklin stove * odometer * bifocals* lightning rod * Franklin stove * odometer * bifocals* lightning rod * Franklin stove * odometer * bifocals