[Reminder: This is a History of Economics (broadly defined) discussion list. Let's keep the discussion within the bounds of HE. HB.] There were and are economic dimensions to the R&D, manufacture, further development/refinement and deployment (including the peripheral personnel costs involved) of all such technologies. In other words, these technologies are in effect (and effectively) "used" while "not being expended to fully devastating effect" Prabhu Guptara