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Aluminum Pull-Tab Cans
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Can tabs are the tabs on the top of cans that you pull back to open the can
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The empty cans are delivered to the drinks factory. The factory fills the cans with whatever beverage they're supplying. The factory puts the can lids on (complete with ring-pull) and a machine seals the edges.
Yes
the pull-ring tab on pop-cans was invented by Frase but was later sold to Alcoa in 1963.
On older cans, they were made of an aluminum pull ring attached to a steel teardrop shaped metal piece. On newer cans, both segments are made of aluminum. The newer versions are made to allow the pull tab (or lever) to remain attached to the can and the pull tab portion to sink into the opening of the can but not separate from the can.
Cost differences
Mikola Kondakow, of Ontario, Canada, invented the pull tab version for cans in 1956 The inventor of the non pull tab can is unknown
aluminum pull tab
Depends on the agency, lawyers, manufacturers and insurance companies.