5. Drawings
5.2 Photographs
The PCT Regulations are silent with regard to photographs. Nevertheless, they are allowed where what is to be shown (for instance, crystalline structures) cannot possibly be presented in a drawing. See GL/PCT‑EPO A‑V, 1.2, PCT AG I 5.159 and PCT Receiving Office Guidelines, Chapter VI, paragraph 146 (GL/RO 146).
Section F‑II, 5.3 in the Guidelines for Examination in the EPO applies mutatis mutandis.