The air-raid legislation of September 1, 1939, promised payment of 90 percent of wages lost, but this had not anticipated the long periods of alarm when there were no attacks. One solution was to change the alarm system to ensure that as little time as possible was lost from productive work, and eventually the two-tier system of general alarm, followed by all-clear, was changed in favor of a series of step alarms in which the local civil defense would be notified first, followed by a “raid possible” siren, then a general alarm. Industries were expected to work through the general alarm until a
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