| 摘要 |
A signalling sheet assembly such as a greetings card 10 has a holder 14 that holds a conducting form such as a wire form 22 and a conducting element such as a wire element 24. The holder 14 is attached to a front part 18 of the greetings card. A holdable conductor 26 is also provided which can be held in the hand and moved. The holdable conductor 26 has a wire loop 30 that can be placed around the wire form to trace the path of the wire form. If the wire loop makes contact with the wire form, an electrical circuit is completed and a sound or light signal is produced. If the wire loop makes contact with the wire element 24 ie when the form has been successfully traversed, an electrical circuit is completed and a different signal is produced.
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