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Hamilton Watch introduces a Pulsar calculator watch in October of 1975. Image: Rept0n1x / CC 3.0
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Sony introduces the Walkman, a commercially available, wearable cassette player. Image: Wikimedia
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Research in Motion (now BlackBerry) launches its first pager, known as the RIM 850. Image: Blackberry / Wikimedia
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The first Bluetooth headset is shipped in the year 2000. Image: Kocio / CC 3.0
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Fitbit releases its first health and fitness device, which is designed to be clipped onto clothing and track steps taken, distance traveled, calories burned, activity intensity and sleep. Retails for $99. (Fitbit Flex pictured) Image: MorePix / CC 3.0
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Sony markets the SmartWatch, which uses Bluetooth to connect to an Android smartphone. It retails for $150 Image: Alexsh / CC 3.0
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Google unveils the beta version of Google Glass to a select group of users known as Explorers. Google Glass is an optical head-mounted display attached to a pair of glasses that is controlled by the user’s voice. It connects to the Internet using Wi-Fi. Image: Antonio Zugaldia / CC 3.0
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Rumors circulate about the coming of Apple’s iWatch, a smartwatch that would connect to the Internet using Wi-Fi. Image: Cryptic C62 / CC 3.0