Solution of the $50,000 Harvard Cooperative Society robbery appeared one step nearer yesterday as Nicholas Maverides was arraigned in Middle sex Superior Court on a charge of armed robbery. He was held in $120,000 bail pending trial of the case.

Maverides, a 38-year old Prince Street, Cambridge, resident, was indicted Monday by a Middlesex Country grand jury on the armed robbery charge. Seven witnesses of the Coop holdup were said by police to have established Maverides' connection with the Friday, January 9 robbery.

None of the other three participants in the Coop holdup is yet known to have been apprehended by police.

The robbery, executed under the cover of two smoke bombs, seized funds that had just been delivered to the Coop for check cashing purposes. Over 200 customers and 75 employees were in the Coop building at the time of the holdup, but most of them, distracted by the first smoke bomb, failed to realize what was going on.

Numerous Burshes

Maverides, part owner of a night-club, has had numerous previous brushes with the law. In 1936 he was given three prison sentences totaling from six to ten years on charges of auto larceny receiving stolen goods, breaking and entering to commit larceny carrying a revolver, and carrying burglar's tools.

He was paroled in August, 1941, but state officials revoked the parole in October, 1944, Maverides was returned to stated prison, and before the close of the year he was turned over to United States authorities to face charges of violation of federal laws.