It is uncertain to what extent the proprietor of a patent is bound by erroneous admissions in his specification1 as to what is old2. It is also uncertain whether the description of an invention as 'relating to' devices of a certain sort amounts to an admission that such devices are old3. To claim an invention as consisting in the presence of certain additional features in articles of a certain 'type' does not debar the proprietor from asserting that the invention is a combination of all the features together, including those
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