ULTRASONIC BONE-DENSITY MEASURING INSTRUMENTS; X-RAY BONE-DENSITY MEASURING INSTRUMENTS; DIGITAL X-RAY RADIOGRAPHY DIAGNOSTIC SYSTEM PRIMARILY COMPRISED OF RADIOLOGICAL APPARATUS FOR MEDICAL PURPOSES, X-RAY DIAGNOSTIC APPARATUS, X-RAY PHOTOGRAPHS FOR MEDICAL PURPOSES; X-RAY BONE DENSITOMETERS; ULTRASONIC DIAGNOSTIC TREATMENT APPARATUS FOR MEDICAL PURPOSES