(under the class definition) Apparatus in which gaseous content is removed from receivers, with or without subsequent refilling with another gaseous material.
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8, for corresponding processes.
59+, for such exhausting followed by filling the receiver with nongaseous material.
64, for evacuation of filled receivers when there is some adaption to the presence of nongaseous material in the receiver.
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53, Package Making, 79+, for gas filling and/or evacuating of receptacles with closing.
417, Pumps, appropriate subclasses for gas pumps, per se, and combined with a space being evacuated in a nonseparable system.
418, Rotary Expansible Chamber Devices, for rotary expansible chamber devices, per se.
