Some miniature tube sockets had a skirt that mated with a cylindrical metal electrostatic shield that surrounded the tube, fitted with a spring to hold the tube in place if the equipment was subject to vibration.
2.
It has also helped in designing electrostatic shields to " harden " the LCA and missiles from microwave attack by the enemy as well as protecting satellites against deadly Electromagnetic Impulses ( EMI ) generated by nuclear weapons and other cosmic disturbances, which " fry " and destroy electronic circuits.
मोबाइल