 that electrogravitics is a true anti-gravity technology that can "create a force that depends upon an object’s mass, even as gravity does".There are claims that all major aerospace companies in the 1950s including Martin, Convair, Lear, Sperry, Raytheon were working on it, that the technology became highly classified in the early 1960s, that it is used to power the B-2 bomber, and that it can be used to generate "free energy".Charles Berlitz devoted an entire chapter of his book on The Philadelphia Experiment ("The Philadelphia Experiment