Following a morning of picketing at the Pennsylvania Convention Center by hundreds of union carpenters, the center's management and Local 8 of the Metropolitan Regional Council of Carpenters reached an agreement Friday, extending the current collective bargaining agreement, which expired April 30, until May 10.

The carpenters are returning to work on Friday, in time to help with the dismantling of a convention held by 13,000 neurologists, set to end Saturday, a convention center spokesman said.

Since beginning picketing Thursday, the carpenters had been both on strike and in a lockout. They were the only union of the six working at the center to picket, and mostly picketed in the loading ramp areas.

Local 98 of the International Brotherhood of Electrical Workers, Local 107 of the International Brotherhood of Teamsters and Local 332 of the Laborers International Union of North America signed extensions until May 6.

Among the issues are work rules governing how much work individual exhibitors can do on their own booths.

Collective bargaining agreements are still in effect for unions representing stagehands and ironworkers.