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15: Shutter Plunger (pre-war A2B & A2F)
16: Focus Indicator (AF & A2F)
17: Focusing Ring (AF & A2F)
Fig. 4-3: Neck area of an Argus A2F
18: Lock Clip
19: Lock Catch
20: Tripod Socket
21: Back Cover
22: Rewind Knob
23: Extinction Meter (A2Bs & A2F)
24: Brightness Pointer (A2Bs & A2F)
Fig. 4-4: Back view of an Argus A2F
25: Slide
26: Aperture Tab
27: Film Speed Tab
28: Shutter Speed Plate
Fig. 4-5: Top view of Exposure Meter/Calculator (A2Bs & A2F)