Image:Heil patent figs.png
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[edit] Summary
Image of figures from British Patent No. 439,457, granted 6th December 1935, based on British application dated 4th March 1935.
[edit] Licensing
This work is in the public domain worldwide. This is because either:
- It is a photograph created by the United Kingdom Government more than 50 years ago; or
- It is an engraving created by the United Kingdom Government and commercially published more than 50 years ago; or
- It is an artistic work other than a photograph or engraving which was created by the United Kingdom Government more than 50 years ago.
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- (del) (cur) 08:14, 28 July 2006 . . Dicklyon (Talk | contribs) . . 378×508 (19,973 bytes) (Image of figures from British Patent No. 439,457, granted 6th December 1935, based on British application dated 4th March 1935. )
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