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 1910 - 1980 (70 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- [S90946] Garth Matthews, Matthews, History of American Crumplers, (Unpublished manuscript, sent to Craig Walsh 14 Nov 2026), Ref J1.4-A9.6#a-5~sp2, Chapter 4: John Crumpler Snr and the J1 John Jnr line.
- [S90946] Garth Matthews, Matthews, History of American Crumplers, (Unpublished manuscript, sent to Craig Walsh 14 Nov 2026), Ref J1.4-A9.6#a-5, Chapter 4: John Crumpler Snr and the J1 John Jnr line.
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