door at right angles, armoured air intake, 30 mm steel doors, ventilation and telephones, internal walls lined with wood, and an emergency exit system. There were over 200 standardised armour parts.

The standardisation greatly simplified the manufacture of equipment, the supply of materials and the budgetary and financial control of the construction as well as the speed of planning for construction projects.

To offset shortages, captured equipment from the French and other occupied countries armies were incorporated in the defences,

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