Use of the radio frequency parts of the electromagnetic spectrum is regulated by governments in most countries, in a process known as frequency allocation. Since radio propagation and RF technology markets do not stop at national boundaries, there are strong technical and economic incentives for governments to adopt harmonised pectrum allocation standards.
A number of forums and standards bodies work on standards for frequency allocation, including:
... de Torres[?], sea explorer
V
Giovanni da Verrazano, (died 1528), sea explorer
Amerigo Vespucci, (1454-1512), discovered other parts of America and gave his name to the ...