Teacher 
Distributor
Set of TWO units working model, each unit is mounted on vertical stand.
Set of TWO units working model, each unit is mounted on vertical stand, all connections are clearly visible to explain the principle of telegraph. Each unit is workable on 4-6 volts DC.
Set of TWO units working model, each unit is mounted on vertical stand, all connections are clearly visible to explain the principle of telegraph. Each unit is workable on 4-6 volts DC.
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