Toys and engineering materials: Figure 13 Toys with steel or aluminium casings without remote control (left) and with corded controller (centre) were swiftly replaced by more advanced toys equipped with cordless controllers (right)

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Toys and engineering materials

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Figure 13 Toys with steel or aluminium casings without remote control (left) and with corded controller (centre) were swiftly replaced by more advanced toys equipped with cordless controllers (right)

3.1 Transisters, circuits and batteries

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