| http://www.w3.org/ns/prov#value | - chanical or electronic locking devices, safes and security vaults.This class excludes:- installation of security systems, such as burglar and fire alarms, without later monitoring, see 43.21- retail sale of electrical security alarm systems, mechanical or electronic locking devices, safes and security vaults in specialised stores, without monitoring, installation or maintenance services, see 47.59
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