Show I Row low Over Rest Periods Closes Plane Plants VANCOUVER B. B C. C April 29 UP UP-T UP UP-Thre UP Three h r e e Boeing aircraft plants in Canada remained closed Thursday after attended attended attended at at- atI tended a mass meeting last nIght stood firm in their for two wo minute 10 rest periods each shift Workers attempting to report for or work as their union requested were turned away by company guards and provincial police All shifts have been locked out since Wednesday morning when em- em loyes in defiance of an order by bythe bythe the he Canadian department of munitions muni- muni ions and supply stopped work for fora a rest period |