AGREEMENT REACHED WITH POSTAL UNIONS ON 3‐YEAR CONTRACT
Postal Service and postal unions reach tentative accord on 3-yr contract on July 21; accord provides 19.5% increase in wages and benefits over 3 yrs, makes recent cost-of-living increases permanent part of workers' wages and preserves no-layoff clause; mgt dropped demand to terminate layoff clause; Fed mediator Wayne L Horvitz's role in settlement noted; mail handlers pres James LaPenta hails pact; in terms of Carter Adm's wage guidelines, settlement is estimated to be 6.5% a yr, slightly higher than 5.5% limit on Fed employees and less than avg for all wage settlements; some local union leaders complain that settlement is inadequate; Postal Workers Detroit exec Ivory Tillman hails it; Postmaster Gen Bolger comments on settlement; illus (L)