"Marconi vortex dynamo [a spherical tank of mercury] to create powerful rotating electromagnetic fields that affected gravity and reduced mass"
http://discaircraft.greyfalcon.us/HAUNEBU.htm
"a transformer generates high temperature in the matter in between the spheres and a force is applied on the inner face of the outer sphere by the inner hallow sphere and the system looses its weight depending on the temperature."
https://patents.google.com/patent/WO2001009509A2/en
"After the power supply is switched on, the mercury rotates anticlockwise at high speed under the action of electromagnetic force, and thrust in a direction deviating from the center of the shell is applied to the wall surface of the whole negative electrode due to centrifugal action. The direction of the total thrust is opposite to that of the gravitational pull, so that the influence of the gravitational pull is counteracted, and the device has the antigravity propelling capacity."
https://patents.google.com/patent/CN110857151A/en
"The plasma, mercury based, is pressurized at 250,000 atmospheres at a temperature of 150 degrees Kelvin and accelerated to 50,000 rpm to create a super-conductive plasma with the resulting gravity disruption. The MFD generates a magnetic vortex field, which disrupts or neutralizes the effects of gravity on mass within proximity, by 89 percent."
https://theeventchronicle.com/secret-plane-tr-3b-patent/
Magnetohydrodynamic (MHD) Propulsion - What Is It?