Summary Box: Google's mobile ad feud with Apple

CHANGING THE RULES: Google thinks Apple is imposing new restrictions that could hobble its ability to sell and place ads on the iPhone, iPad and iPod Touch.

THE POSSIBLE FALLOUT: AdMob, a mobile ad service recently acquired by Google for $750 million, says Apple's changes will stifle competition and reduce revenue for developers of applications on the iPhone and iPad.

THE TENSION: Apple tried to buy AdMob before getting trumped by Google last fall. Incase EC20002 Car and Wall Charger for iPhone. That was the latest bit of bad blood between Google and Apple, one-time allies whose relationship has deteriorated as they have increasingly clashed in the mobile device market.