IPC 2013 : E05B 65/40 : Locking one door by shutting another (by non-mechanical means E05B 47/00, E05B 51/00; operation of locks by mechanical transmissions E05B 53/00; fastenings, other than locks, for double doors E05C 7/06).

IPC2013 > E > E05 > E05B > E05B 65/00 > E05B 65/40[3] > Locking one door by shutting another (by non-mechanical means E05B 47/00, E05B 51/00; operation of locks by mechanical transmissions E05B 53/00; fastenings, other than locks, for double doors E05C 7/06).
Notes[t] E01 - E06: BUILDING
Notes[g] E05B 63/00 - E05B 67/00: Locks with special structural characteristics or for special use
E SECTION E — FIXED CONSTRUCTIONS.
E05 LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES.
E05B LOCKS; ACCESSORIES THEREFOR; HANDCUFFS.
E05B 65/00 Locks for special use.
E05B 65/40 · · · Locking one door by shutting another (by non-mechanical means E05B 47/00, E05B 51/00; operation of locks by mechanical transmissions E05B 53/00; fastenings, other than locks, for double doors E05C 7/06).