A recording device that is coupled to a book. The recording device records, saves and plays back a plurality of discrete messages. An archival control disables and enables the device, thus permitting the user to ensure that no new messages will be accidentally recorded over existing saved messages....http://www.google.fr/patents/US6167233?utm_source=gb-gplus-shareBrevet US6167233 - Device for recording multiple discrete messages for a book
Device for recording multiple discrete messages for a book
