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References
- ↑ Permali Gloucester Limited Home Page Archived 9 May 2008 at the Wayback Machine . Permali.co.uk. Retrieved 18 August 2011.
- ↑ http://www.flightglobal.com/pdfarchive/view/1947/1947%20-%201903.html [ dead link ]
- ↑ airscrew blades | li hydulignum | hydulignum two-way | 1942 | 2476 | Flight Archive. Flight International (26 November 1942). Retrieved 18 August 2011.
- ↑ Flight, 10 September 1954
- ↑ Archived 15 September 2008 at the Wayback Machine
- ↑ Archived 15 September 2008 at the Wayback Machine
- ↑ Flight, 9 November 1956
