sentences:  These offered higher wages and more welfare advantages, such as paid sick leave, than the collective bargaining agreements, and were used by the company to reduce the trade unions' influence in an attempt to reduce strikes.However, the move resulted in trade unions striking between 12 May 1928 and 13 April 1929, without them succeeding in reducing the output.The conflict resulting in intra-worker conflicts between the strikers and non-unionized.