BEHIND THE NEWS Safety firm’s sale a bonanza-and that’s no accident:
Aearo Technologies Inc., the maker of earplugs and other protective gear, has long been a quiet company. But given its recent performance and the announcement this month that a private equity firm is buying it for an eye-popping $765 million, no one would call it a sleepy one. Indeed, interviews and a review of regulatory filings show the northwest-side company has been on a tear, boosting sales from $284 million in fiscal 2001 to $423 million in fiscal 2005. In…