URI(s)
Variants
- Helfrick, Albert
Identifies LC/NAF RWO
Identifies RWO
Exact Matching Concepts from Other Schemes
Closely Matching Concepts from Other Schemes
Sources
- found: His Amateur radio equipment fundamentals, c1982:t.p. (Albert D. Helfrick, Cessna Aircraft)
- found: His Modern aviation electronics, 1984:CIP t.p. (Albert Helfrick) data sheet (b. 1945)
Instance Of
Scheme Membership(s)
Collection Membership(s)
Change Notes
- 1981-02-18: new
- 1984-03-22: revised
Alternate Formats