TY - GEN ED - National Acoustic Laboratories (Australia) TI - A guide to the use of the Calaid body-level hearing aid SN - 0642934878 PY - 1975/// CY - Canberra PB - : Australia. Dept. of Health KW - Body Hearing Aids KW - E.007.814.458.100 KW - consumer information (form subheading) KW - Australia (country of publication) N1 - Cover title: A guide to the use of the Calaid body-level hearing aid ER -