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BR0006139A
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Headphone device configuration for use with a telephone handset.
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US6078825A
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Modular wireless headset system for hands free talking
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US6230029B1
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Modular wireless headset system
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US5959434A
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Mechanical charging selection apparatus
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US6027828A
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Modular stackable battery pack and accessories
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US6193558B1
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Cigarette lighter adapter with securing ring
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US5847541A
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Universally interchangeable and modular power supply with integrated battery charger
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US6227888B1
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Interchangeable plug device
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US5684689A
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Interchangeable plug power supply with automatically adjusting input voltage receiving mechanism
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