Post; Beach artillery - Invisible cannons

battery · September 19th, 2004

Does anyone have any information on these? I saw them on a history channel program ( modern marvels ? ) it intrigued me, does anyone have any pictures of these?

September 19th, 2004
battery Centurion	Post; Beach artillery - Invisible cannons Does anyone have any information on these? I saw them on a history channel program ( modern marvels ? ) it intrigued me, does anyone have any pictures of these?