Time switch classification: timers that control circuits are classifiable as time switches, not as clocks or counters. Devices that automatically make or break electrical circuits on a preset programme, lacking clock characteristics and not functioning as time-of-day recorders or counters, are classifiable as time switches used for control of circuits rather than under headings for clocks or for revolution/production counters; the Board has accepted this classification and directed dissemination to field formations and trade.