As example, Corbin had a system which used a round, removable cylinder which fit into a thin outer shell. Other companies did try to follow the lead of Best Lock with removable core locks systems of their own. The small format interchangeable core (SFIC) revolution was underway. After the war many peace-time applications were found and Best Lock developed sales for IC cylinder in commercial applications. Because IC cylinders can be immediately changed without major components being removed from the door, government installations were often equipped with Best IC cylinders during World War II. IC locks were first brought to public attention by the Best Lock Company more than 70 years ago. Interchangeable core (IC) lock systems have been steadily gaining in popularity.
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