Bell ringer

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  • Kentron automatic bell ring.

    Kentron automatic bell ring.

  • Example of bell ringer. Photo provided by Harlock.

    Example of bell ringer. Photo provided by Harlock.

Patent

  • US Patent 962688 "Automatic bell-ringer" Figure 1.

    US Patent 962688 "Automatic bell-ringer" Figure 1.

  • US Patent 962688 "Automatic bell-ringer" Figure 2.

    US Patent 962688 "Automatic bell-ringer" Figure 2.

External Links

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