Offering premium quality Fully Automatic range of Patcher Machine / Patching Machine, Mass Mailers, Paper Folding Machine, Envelope Window Pasting Machine, Carton Window Pasting Machine, Inland Letter Gumming, Folding & Perforating Machines (Mass Mailers), etc. An Overview All the manufacturing processes and allied activities that are performed at Tech Master Engineering, are accomplished in sync with the international parameters and its products are known for unmatched features that exhibit quality and.