| English language abstract of Japanese Publication No. 55-50217. |
| English language abstract of Japanese Publication No. 54-111842. |
| English language abstract of Japanese Publication No.54-111841. |
| English language abstract of Japanese Publication No.1-136114. |
| English language abstract of Japanese Publication No.56-29209. |
| English language abstract of Japanese Publication No.44-15392. |
| English language abstract of Japanese Publication No.5-157997. |
| English language abstract of Japanese Publication No. 612621. |
| English language abstract of Japanese Publication No. 5-40493. |
| English language abstract of German Publication No. 9216919. |
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| English language abstract of German Publication No. 43 16 698. |
| English language abstract of German Publication No .39333310. |
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| English language abstract of French Publication No. 1266652. |
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| English language abstract of Taiwan Publication No. 274588. |
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| Pentax Alleged Publication on Twincome. |