|rnwTHE MERC HAN £i S K MARTO.w| Invisible Ray Detective £ This photd-electric detective ge aerates- an invisible ray which setj off an alarm in an adjacent room, or a neighbor’s house, when an intruder passes through it. Any deliberate movement of the units or their disconnection from wall outlets will likewise cause the alarm to sound. A glass infra red filter placed in the unit at the right in the sketch blots out all visible rays thus giving an intruder no warning.
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Greymouth Evening Star, 18 July 1939, Page 12
Word Count
82Page 12 Advertisements Column 3 Greymouth Evening Star, 18 July 1939, Page 12
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