"Not just depositing visiting cards but ensuring that they were printed in the correct (embossed) format. And then when and where to leave them suitably annotated with the cabalistic " ppc" the meaning of which I've happily forgotten."
And 'lady officers' had different sized cards . . . . (well, we did in 1957)
(and PPC was 'pour prendre conge' - can't get this machine to do the accent above the final 'e' - before departing)