74412771
Jul 15, 1993
Mar 26, 1996
materials; namely, coated microspheres (cenospheres) to control reflection and/or absorption of electromagnetic radiation
Electrical and Scientific Apparatusresearch and development for others of shielding materials to attenuate, absorb and control electromagnetic energy; consulting services associated with the testing and evaluation of various shielding materials to attenuate, absorb, and control electromagnetic energy
Computer and Scientific