| http://www.w3.org/ns/prov#value | - U.S. Pat. Nos. 2,918,671 and 2,954,552 to Halpern, disclose coating propeller blades for absorbing incident microwave radiation at pre-selected wave lengths comprising finely divided particles such as aluminum graphite, copper and the like, dispersed substantially insulated from each other in a neutral binder such as waxes, resins, rubbers, and the like and protective layers for absorbing incident
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