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| category = [[Occupational safety and health]] ...e magazine was launched as a quarterly in 1988 by the Occupational Safety and Health Service (OSH) of the [[Department of Labour (New Zealand)|Department

...s tuned to different stations by moving the sliding contact ''(right)'' up and down the tuning coil ''(red)''. The device at top is the [[cat's whisker de ...s of radio. It needs no [[battery (electricity)|battery]] or power source and runs on the power received from [[radio waves]] by a long wire [[antenna (r