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MFR. No. : 731102
STOCK No. : 3521-NJ3
Build a doorbell telegraph system and even a catapult all using a true electromagnet. Kit includes: disc latch and neodymium magnets compass straws wires sand paper switch plates wood screws nails light bulbs battery holders iron filings pre-drilled wood blocks light emitting diode (LED) and experiment and project book.