http://www.charm.rhul.ac.uk/history/p20_4_1.html CHARM http://www.charm.rhul.ac.uk/history/p20_4_1.html http://www.charm.rhul.ac.uk/history/p20_4_1.html CHARM CHARM http://www.charm.rhul.ac.uk/history/p20_4_1.html http://www.charm.rhul.ac.uk/history/p20_4_1.html CHARM CHARM early audio technology http://www.charm.rhul.ac.uk/history/p20_4_1.html http://www.charm.rhul.ac.uk/history/p20_4_1.html CHARM early recording history CHARM CHARM http://www.charm.rhul.ac.uk/history/p20_4_1.html http://www.charm.rhul.ac.uk/history/p20_4_1.html CHARM http://www.charm.rhul.ac.uk/history/p20_4_1.html CHARM CHARM CHARM http://www.charm.rhul.ac.uk/history/p20_4_1.html CHARM http://www.charm.rhul.ac.uk/history/p20_4_1.html