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In page Pony Express:

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From 1866 until 1889, the Pony Express logo was used by stagecoach and freight company Wells Fargo, which provided secure mail service. Wells Fargo used the Pony Express logo for its guard and armored-car services.[citation needed] The logo continued to be used when other companies took over the security business into the 1990s. Since 2001, the Pony Express logo is no longer used for security businesses, since the business has been sold.[1]