![]() Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US402201A Inventor Richard W Hale Patrick Tan Richard C Stowell Donald E Ordway Current Assignee (The listed assignees may be inaccurate. Google Patents Gas flow visualization system and control apparatusÄownload PDF Info Publication number US3869909A US3869909A US402201A US40220173A US3869909A US 3869909 A US3869909 A US 3869909A US 402201 A US402201 A US 402201A US 40220173 A US40220173 A US 40220173A US 3869909 A US3869909 A US 3869909A Authority US United States Prior art keywords supply panel gas bubble heads Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US3869909A - Gas flow visualization system and control apparatus US3869909A - Gas flow visualization system and control apparatus
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