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60887:2010 defines the A bulb shape as: The same standard also defines in addition to the A shape also bulged (B), conical (C), elliptical (E), flame (F), Globular (G), (K), mushroom (M), (P), reflector (R), straight-sided (S) and tubular (T) bulb shapes, as well as several modifier letters and special shapes. Very similar to the A shape are the P shape ("A bulb having a spherical end section, and a conical mid section, the sides of which are tangent to the curve of the spherical section"), and its PS variant ("Tubular neck section below the

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