Disclaimer This blog is about the graphic design of burglar alarms and has no connection with the companies featured. Most photos show vintage sounders and are not the latest products of the firms under discussion. For up-to-date info on any company, please visit their official website.
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- MikeP on “ExtraWatch Security Systems”, Islington: which witch
- MikeP on “ExtraWatch Security Systems”, Islington: which witch
You’re assuming cal is short for call. I always read it as short for calibration, as in http://www.caltechservice.co.uk/ or similar. (Randomly plucked from a list, no spamming or SEO things going on there ;) ).
You could well be correct – of course that never occurred to me!