Radiant energy – Invisible radiation responsive nonelectric signalling – Photographic type
Patent
1976-11-29
1978-02-21
Willis, Davis L.
Radiant energy
Invisible radiation responsive nonelectric signalling
Photographic type
250444, G03B 4116
Patent
active
040754944
ABSTRACT:
A holder for a dental x-ray film paquette is shaped for oral reception and retention by the teeth or gums of a patient. The film paquette is maintained in an exposure position on the holder by frictional engagement with a slot in the holder or with a number of projections on either or each of the facing surfaces of the slot. The holder is also provided with means external of the mouth for indicating the generally central position of the film paquette to aid the technician in properly positioning the x-ray head.
REFERENCES:
patent: 2553028 (1951-05-01), Wright
patent: 2782317 (1957-02-01), Vacanti et al.
patent: 3444371 (1969-05-01), Via, Jr.
Seebach Lloyd F.
Willis Davis L.
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