What developments have tape recorders undergone?

credentials

BGE: 108 V 212, 112 V 399, 101 V 52, 108 V 5more ..., 112 V 15, 101 V 269, 101 V 267, 112 V 349, 108 V 254, 113 V 44, 112 V 305, 114 V 260, 105 V 185, 113 V 45, 114 V 22, 115 V 202, 103 V 16, 101 V 53, 99 V 35, 107 V 87, 101 V 58, 98 V 211

Article: Art. 12 IVG, Art. 2 para. 1 IVV, Art. 12 para. 1 IVG, Art. 21 IVGmore ..., Art. 21 para. 1 IVG, Art. 21 para. 2 IVG, Art 4 IVG, Art. 14 IVV, Art. 2 HVI, Art. 8 para. 1 IVG, Art. 5 para. 1 IVG