Theodore Patrick Flynn (1891-1954) was an equipment development engineer for the U.S. Forest Service, Region 6, and director of the USFS Equipment Laboratory in Portland, Oregon, 1936-1949. Collection includes biographical materials, patents, blueprints, specifications, reports, photographs, clippings, a photo album, and memorabilia regarding design of specialized equipment used in forestry and construction work, particularly for controlling forest fires.

Collection includes 1 elevation, with weather vane plan, on 1 sheet and 237 blueprint plans, elevations, sections, details and schedules on 55 sheets of Timberline Lodge in the Mount Hood National Forest, Oregon.