Synchronous motor driven timeswitch with clockwork backup
Time Measurement
1970
Synchronous motor driven timeswitch with clockwork backup, for domestic use, type V Mk 5 SRS SEL, maker's no. M51743, contacts rated 80A, UK patent no.824687, by the Horstmann Gear Co Co. Ltd., Bath, England, also marked `Property of SEEB', dated 4/70 on adhesive label