Radiant energy – Fluent material containment – support or transfer means – With irradiating source or radiating fluent material
Patent
1980-03-19
1981-08-25
Smith, Alfred E.
Radiant energy
Fluent material containment, support or transfer means
With irradiating source or radiating fluent material
A61B 614
Patent
active
042861624
ABSTRACT:
The disclosure relates to a film feed speed control system in a dental radiographic apparatus for photographing the entire jaws, which apparatus has an X-ray generator and an X-ray film cassette holder mounted respectively at one end of a rotary arm of the apparatus and at the other end thereof. The system is designed to enable change in the magnification factor of an X-ray photograph by electrically and automatically increasing or decreasing the X-ray film speed independent of the X-ray generator.
REFERENCES:
patent: 4039837 (1977-08-01), Ohta et al.
patent: 4247779 (1981-01-01), Ciavattoni et al.
Grigsby T. N.
Kabushiki Kaisha Morita Seisakusho
Smith Alfred E.
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