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- Abbe condenser
- achromatic lens
- aerial camera
- afocal lens
- Allegheny Observatory
- amplitude of accommodation
- aperture ratio
- Aplanatic Reflector Antenna
- Assiniboine, Mount
- astigmatic foci
- astigmatism
- Astrograph
- Astronomical Instruments and Devices
- Auxiliary Lens
- back focal length
- Barlow lens
- binoculars
- camera
- Camera Shutter
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- foamed plastic
- foamed polystyrene
- foamed slag
- foamed-in-place insulation
- foamed-in-situ plastics
- foamflower
- foaminess
- foaming
- Foaming Agent
- foaming space
- foam-in-place
- foam-laminated fabric
- Foard County
- Foawr
- fob
- FOBTV
- FOCA
- FOCAL
- focal adhesion plaque
- focal chord
- focal distance
- focal infection
- focal length
- Focal lighting
- focal lines
- focal liver disease
- focal plane
- focal point
- focal power
- focal property
- focal radius
- focal ratio
- focal seizure
- focal spot
- focal-plane array
- Focal-Plane Shutter
- Foch
- Foch space
- Focillon, Henri
- FOCIS
- Fock, Jeno
- FOCL
- focometer
- Focsani
- focus
- focus control
- FOCUS Desktop
- FOCUS Fusion
- focus group
- focus lamp
- Focus of Mass Destruction
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- focal keratosis
- focal keratosis
- focal keratosis
- focal keratosis
- Focal Legnth
- Focal Legnth
- Focal Legnth
- Focal Legnth
- focal length
- focal length
- focal length
- focal length
- focal length
- Focal length multiplier
- Focal Length to Diameter Ratio
- focal lengths
- focal lengths
- focal lengths
- focal lengths
- focal lesion
- focal lesion
- focal lesion
- focal lesion
- focal lesion
- Focal lighting
- focal line
- focal line
- focal line
- focal line
- focal lines
- focal liver disease
- focal lymphocytic thyroiditis
- focal macular melanosis
- focal macular melanosis
- focal macular melanosis
- focal metastatic disease
- focal motor seizure
- focal motor seizure
- focal motor seizure
- focal motor seizure
- focal myelitis
- focal myelitis
- focal myelitis
- focal myelitis-encephalitis
- focal myelitis-encephalitis
- focal myelitis-encephalitis
- focal myelopathy
- focal myelopathy
- focal necrosis
- focal necrosis
- focal necrosis
- focal nephritis
- Focal Neurological Deficit
- focal neuropathy
- focal neuropathy
- focal neuropathy
- Focal nodular hyperplasia
- Focal nodular hyperplasia
- Focal nodular hyperplasia
- Focal nodular hyperplasia
- Focal Nodular Liver Hyperplasia
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