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Creator
- Adair, Neal G.
- Adams, Edith 3
- Adkins, H. E. (Hector Ernest), 1885-1962 1
- Aero Surveys Limited 1
- Alexander, Henry, 1890-1975 1
- Alexander, Michael, 1920-2004 1
- American Cystoscope Makers, Incorporated 1
- American Thread Company 2
- Anders, F. 1
- Anders, Fred 1
- Andrews, Ralph W. (Ralph Warren), 1897-1988 2
- Arbuthnot, May Hill, 1884-1969 1