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 1932 - 1992 (60 years)
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| Sources |
- [S90946] Garth Matthews, Matthews, History of American Crumplers, (Unpublished manuscript, sent to Craig Walsh 14 Nov 2026), Ref J1.4-A9.6#a-2~sp2, Chapter 4: John Crumpler Snr and the J1 John Jnr line.
- [S90946] Garth Matthews, Matthews, History of American Crumplers, (Unpublished manuscript, sent to Craig Walsh 14 Nov 2026), Ref J1.4-A9.6#a-2, Chapter 4: John Crumpler Snr and the J1 John Jnr line.
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