MAGNETIC TAPE TRACK DEVELOPER-NAMELY, A FAST-DRYING SPRAY WHICH LEAVES A VISIBLE POWDER ADHERED TO THE MAGNETIZED PATTERN ON THE MAGNETIC TAPE

CONSULTING ENGINEERING SERVICES, PRIMARILY IN THE MAGNETIC RECORDING FIELD

MAGNETIC RECORDING HEADS, REPRODUCING HEADS AND ERASE HEADS, AND COMBINATIONS THEREOF FOR USE WITH COMPUTERS, DIGITAL INFORMATION RECORDING AND RETRIEVAL SYSTEMS, AND DIGITAL INSTRUMENTATION SYSTEMS

SOUND REPRODUCING AND RECORDING APPARATUS, PARTS THEREOF AND ACCESSORIES THERETO-NAMELY, MAGNETIC RECORDING HEADS, TAPE RECORDING AND PLAYBACK INSTRUMENTS AND MAGNETIC PICKUP HEAD TEST EQUIPMENT