The 49ers did three things on Friday:
* They signed safety Jaquiski Tartt to a contract extension.
* They had a press conference with their first-round draft pick, Mike McGlinchey, and showed him around the stadium and facility.
* They traded right tackle Trent Brown.
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Tartt is one of the team's "Monday guys," one of the players who always seems to be at the 49ers facility.