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they were made out of metal
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∙ 13y ago
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How made bifocals?
they were made out of metal
Where and when were the bifocals invented?
ben Franklin invented his bifocals at his house in philly and made them on March 23.1784
When were bifocals made and how long they were made?
1783 and was made until now
What is a sentence with the word bifocals in it?
Please help me find my bifocals.
What is a sentence using the word bifocals?
The bifocals he bought were used. The lower lenses on my bifocals allow me to read more easily.
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
What is the bifocals patent number?
Bifocal lenses as a concept were not patented; there are dozens of patents related to bifocals, bifocal contacts, and processes to make bifocals.
Where were bifocals invented?
bifocals were invented on the 300th block of Market street in Philadelphia
