Topic: physical therapy vibration gun

Till 1968, visible and infrared LEDs were extremely pricey, within the order of US$200 per unit, and so had little sensible use. TVs, radios, telephones, as well as watches. Hewlett-Packard (HP) was engaged in analysis and development (R&D) on sensible LEDs between 1962 and 1968, by a research group below Howard C. Borden, Gerald P. Pighini at HP Associates and HP Labs. Throughout this time HP collaborated with Monsanto Firm on growing the first usable LED products. Monsanto was the primary grou...