In T 32/84
(OJ 1986, 9) it was pointed out that the fact that certain elements of an invention essential to its operation were not referred to explicitly either in the claims, or in the relevant portion of the description nor shown in the drawing of the invention as claimed did not necessarily mean that the application did not disclose the invention in a manner sufficiently clear and complete for it to be carried out by a person skilled in the art as required by Art. 83 EPC 1973
. In the case in question, a person skilled in the art could have put the invention into practice by applying a principle disclosed in the description which showed as essential to the invention an element shown not in the figure illustrating the invention as claimed, but in another figure in the application. This, however, only applied if he did not make use of additional teachings and no inventive step was involved.