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Emergency power supply device with alternating output voltage.
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Method and device for powering and protecting an electronic apparatus, particularly a computer apparatus.
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Electrical supply apparatus with alternate voltage output
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Electrical supply apparatus with alternate voltage output
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Solar heating system
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Circuit electricque imprime
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Printed electric circuit
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Keyboard with push-buttons
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Printed circuit and manufacturing process thereof.
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Control panel with mechanical control switches and device including this panel
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Control keyboard for electric or electronic devices
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Electrical or electronic switching device forming push button or keyboard with socket keys
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Control keyboard with switches of mechanical constructions
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Control keyboard
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KEYBOARD WITH PUSH BUTTONS FOR ALPHANUMERIC CONTROL OF AN ELECTRIC OR ELECTRONIC MACHINE
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Alphanumeric control keyboard with depressible keys for electric or electronic machines
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Control push-button device for switching an electronic or electric circuit
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Rotary switch
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