In 1909, P.L Robertson received a patent of which one of these products that is primarily used only in Canada?

9th-class-result-2022

google ads 1

In 1909, P.L Robertson received a patent of which one of these products that is primarily used only in Canada?

Correct

Screws

Incorrect

Nuts

Incorrect

Washers

Incorrect

Nails

Google Ads