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US5198773A - Non-intrusive gas-level measurement apparatus ... US07/634,058 US63405890A US5198773A US 5198773 A US5198773 A US 5198773A US 63405890 A US63405890 A US 63405890A US 5198773 A US5198773 A US 5198773A Authority US United States Prior art keywords voltage generating controlling electrodes window unit Prior art date 1990-12-21 Legal status (The legal status is an assumption and is not a legal conclusion.

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