A host computer is used to enter into a measuring apparatus to be leased, a contracted term of lease and the date when the lease starts, and/or a contracted number of times the measuring apparatus can be used, and the warning time when a warning message should be given. After the warning time, the warning...http://www.google.fr/patents/US6556894?utm_source=gb-gplus-shareBrevet US6556894 - System for restricting use of a measuring apparatus
System for restricting use of a measuring apparatus
