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Patents
Patents Assigned to Critical Industries, Inc.
Patents Assigned to Critical Industries, Inc.
Negative pressure air filtration housing
Patent number:
D316447
Type:
Grant
Filed:
September 19, 1989
Date of Patent:
April 23, 1991
Assignee:
Critical Industries, Inc.
Inventors:
James C. Woodson, Ron W. Mumford, Kenneth S. Kondo