Lines with other classes and within this classExcluded from this class are light wave modulators which are classified elsewhere. (See References to Other Classes, below.) Excluded from this class are pulse code modulators and delta modulators which are now classified elsewhere. (See References to Other Classes, below.) Excluded from this class are those devices comprising an oscillator combined with or including a specific element which is merely responsive to an external physical condition (e.g., ambient temperature) and which thereby varies a parameter (e.g., amplitude or frequency) of the oscillator. Such devices are classified elsewhere. (See References to Other Classes, below.) However an oscillator in combination with significant modulating structure is classified in Class 332. Classes 330 Amplifiers and 331 Oscillators contain subject matter directed to subcombinations potentially usable in modulators (e.g., an electrical amplifier combined with suitable gain control structure could be utilized as an amplitude modulator). Therefore, these classes should be considered in completing the search for subject matter of Class 332. See the related SEARCH CLASS notes in References to Other Classes, below. Many classes contain subject matter which includes modulators or devices analogous to modulators as subcombinations thereof. Thus, as appropriate, combination classes listed below in the SEARCH CLASS notes in References to Other Classes, below, should be considered in completing the search of subject matter relevant to Class 332. See the Glossary, below, for nonelectrical modulators. MODULATORS OF NONELECTRICAL TYPE The term modulator has a variety of meanings outside of the electrical art. Foremost among these are fluid control devices and optical control devices. Examples of fluid control type modulators and optical type modulators can be found in References to Other Classes, below. Other diverse types of nonelectrical modulators can be found in References to Other Classes, below. | 
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