Where a business listing has been updated by users, any user can view the previous revisions (revision history). In the case of an unclaimed listing any user can roll-back (revert) the listing to a previous state. In the case of a claimed listing, only the claimant can roll-back the listing.
See also…
Update, edit, enhance or correct a business listing
Roll-back incorrect changes
Brownbook - The Global Business Listing Database 