0
Add your answer:
Earn +20 pts
When did William H. Wadsworth die?
William H. Wadsworth died on 1893-04-02.
When was William H. Wadsworth born?
William H. Wadsworth was born on 1821-07-04.
What has the author Frank H Wadsworth written?
Frank H. Wadsworth has written: 'Public forestry research in Latin America, its status and needs' -- subject(s): Forests and forestry, Research 'Montane forest management in the insular Caribbean' -- subject(s): Forest management, Mountain ecology
What did J H Muller invent?
the computer
What did Leo H Baekeland invent?
Plastic
Who built 10 gauge shotguns?
Many companies built them in both black and smokeless powder variants. Remington, Ithaca, H&H, Greener, Wadsworth, etc..
What did Willis h Carrier invent?
Willis H Carrier invented the air conditioner
What did John H Hammond JR invent?
djlvgihcuhe
What did john h Jordan invent?
the clothes dresser
What did John H. Smith invent?
Lawn Sprinkler
Who invented toothbrush?
The first toothbrush to resemble the modern toothbrush is believed to have been invented in China in the late 1400s, which used the stiff hairs from a hog's neck, attached to a bamboo stick.People have been cleaning their teeth with twigs and chewed sticks for thousands of years, but the first real brush recorded was in China in 1223.In 1780 William Addis of Clerkenwall, England, made the first mass-produced toothbrush for sale. The first ones were made from bone and boar bristles.In America H. N. Wadsworth patented a toothbrush in 1857 but it wasn't mass-produced till 1885.The first toothbrush NOT made with animal hair, but with nylon bristles, by Dupont, went on sale in 1938.The first electric toothbrush was developed in 1959, by Bristol-Myers.In China around the year 1500, records show of a brush using bristles made of hair from the back neck of a boar. It is only in 1938 that Dupont de Nemours introduced the Nylon Bristles.
Whoinveneted the tooth brush?
The toothbrush as we know it today was not invented until 1938. However, early forms of the toothbrush have been in existence since 3000 BC. The bristle toothbrush, similar to the type used today, was not invented until 1498 in China. The bristles were actually the stiff, coarse hairs taken from the back of a hog's neck and attached.Boar bristles were used until 1938, when nylon bristles were introduced by Dupont de Nemours. The first nylon toothbrush was called Doctor West's Miracle Toothbrush.The first mass-produced toothbrush was made by William Addis of Clerkenwald, England, around 1780.The first American to patent a toothbrush was H. N. Wadsworth, (patent number 18,653,) on Nov. 7, 1857.Mass production of toothbrushes began in America around 1885.One of the first electric toothbrushes to hit the American market was in 1960. It was marketed by the Squibb company under the name Broxodent.
