Publication Date: 01/08/2019 Filing Date: 10/23/2014 Export Citation: Click for automatic bibliography generation Assignee: Racal Acoustics Ltd. International Classes: H04R1/10;A61F11/08;H04R1/34;A61F11/14 Field of Search: 381/322, 381/359, 381/356, 381/357, 381/313, 381/328 ...