G04B 21/005
Periodical acoustic signalling arrangements
Official title: {Periodical acoustic signalling arrangements (G04B21/02 takes precedence); (adjustment of the frequencyby setting the length of the pendulum G04B18/003; metronomes G04F5/02)}
G04B21/005 (Periodical acoustic signalling arrangements) appears on 1 US grants and 0 published applications in this corpus.
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- 1
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- 1
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- 24 Apr 1984
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| 1984 | 1 | 0 |
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