FACTOID # 29: 73.3% of America's gross operating surplus in motion picture and sound recording industries comes from California.
 
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Class 315: ELECTRIC LAMP AND DISCHARGE DEVICES: SYSTEMS / U.S. Patent Classification Definitions (14444 words)
This class (315) includes, in subclasses 56+, combined space discharge devices and electric switch structures where the device claimed includes electrodes other than the switch electrodes, their supports, or lead-in means for establishing an electric space discharge.
Class 315 provides electric systems for supplying electric current to an electric arc where the arc is specified by name only as a welding and/or heating arc.
In Class 315, the load device may be a radiant energy sensitive device; that is a lamp or discharge device whose operation is altered when subjected to radiant energy, or the system may include a radiant energy sensitive device such as a photocell which controls the operation of the load device.
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