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In [[1943]], in an attempt to follow the success of the [[Parker 51]], was introduced [[Fifth Avenue]], a plastic model with [[hooded nib]], which unlike the [[51]] had limited success. The bulk of sales remained that of [[Skyline]] so that in [[1946]] the line [[Fifth Avenue]] was retired. Despite the company was solid, the [[Eversharp]] was again facing a period of decline.

In [[1943]], in an attempt to follow the success of the [[Parker 51]], was introduced [[Fifth Avenue]], a plastic model with [[hooded nib]], which unlike the [[51]] had limited success. The bulk of sales remained that of [[Skyline]] so that in [[1946]] the line [[Fifth Avenue]] was retired. Despite the company was solid, the [[Eversharp]] was again facing a period of decline.

Ironically it was the decision to invest heavily on technical innovation over a revolutionary invention, the ballpoint pen, to inflict a mortal blow to the company. In [[1945]] the [[Eversharp]] began to take an interest in the development of the ballpoint pen acquiring the rights to use the ''Biro''  pen the by Argentine producer  ''Eterpen Co.'', but before the launch of its ''CA (Capillary Action)'' another company, the  ''Reynold's International Pen Company'' put on the market another ballpoint pen. That gave rise to a furious legal battle, that was lost since the invention was already covered by an expired patent from 1888.

Ironically it was the decision to invest heavily on technical innovation over a revolutionary invention, the ballpoint pen, to inflict a mortal blow to the company. In 1945 the [[Eversharp]] began to take an interest in the development of the ballpoint pen acquiring the rights to use the ''Biro''  pen the by Argentine producer  ''Eterpen Co.'', but before the launch of its ''CA (Capillary Action)'' another company, the  ''Reynold's International Pen Company'' put on the market another ballpoint pen. That gave rise to a furious legal battle, that was lost since the invention was already covered by an expired patent from 1888.

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