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Patent US 4013855A: Difference between revisions
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Used in e.g. [[7B10]]/[[7B15]], [[7B80]]/[[7B85]]/[[7B87]] | |||
<gallery> | <gallery> | ||
Patent 4013855.jpg | Patent 4013855.jpg | ||
7b80-opt2-xy-top.jpg | 7b80-opt2-xy-top.jpg | ||
</gallery> | </gallery> | ||