发明授权
US4147662A Film holder 失效
电影持有人

Film holder
摘要:
Reproducible panoramic x-ray photographs of the dental arches are secured with a portable film holder apparatus that is used in conjunction with an independent x-ray camera unit. The film holder is composed of a photographic plate holder assembly used in combination with a sectional photographic plate shield assembly and an x-ray camera aiming system.
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