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Various breweries used crowntainers and conetops until the late 1950s, but many breweries kept using the simple cylindrical cans.The popularity of canned beverages was slow to catch on, as the metallic taste was difficult to overcome with the interior liner not perfected, especially with more acidic sodas. First for the distributors, flat-top cans were more compact for transportation and storage and weighed less than bottles.Cans were typically formed as cylinders, having a flat top and bottom.They required a can piercer, colloquially known as a "church key", that latched onto the top rim for leverage; lifting the handle would force the sharp tip through the top of the can, cutting a triangular hole.The ring was riveted to the center of the top, which created an elongated opening large enough that one hole simultaneously served to let the beverage flow out while air flowed in. Fraze had forgotten to bring a can opener and was forced to use a car bumper to open a can of beer.
These were developed by Crown Cork & Seal (now known as Crown Holdings, Inc.), a leading beverage packaging and beverage can producer.
There were three types of conetops: high profile, low profile, and j-spout.
The low profile and j-spout were the earliest, dating from about 1935.
From this time, lightweight tin cans could be used.
Felinfoel was a major supplier to British armed forces abroad in the Second World War - cans saved a great deal of space and weight for wartime exports compared to glass bottles, and did not have to be returned for refilling.