Penerapan technological tying dalam hukum persaingan usaha (antitrust law) di Amerika Serikat berdasarkan putusan Leasco Response INC. (1976), Foremost Pro Color inc. 1983, dan Microsoft Corporation (2001) = Application of technological tying in antitrust law in United States of America, based on Leasco Response Inc, (1976), Foremost Pro Color Inc. (1983), and Microsoft Corporation (2001)