The Senate yesterday voted 53-46 to approve a joint resolution (S.J. Res. 8) to nullify a National Labor Relations Board final rule changing the process for filing and processing petitions for union representation of employees. Effective April 14, the rule will shorten the time between a union filing a petition for election and the NLRB holding an election from an average 38 days to as few as 14. The Coalition to Protect a Democratic Workplace, whose members include the AHA, last week urged the Senate to adopt the resolution to adequately assure employees the fullest freedom in exercising their right to choose whether to be represented by a union. The House must pass a similar resolution (H.J. Res 29) before the legislation goes to the president, who has said he will veto it if it reaches his desk.