Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible
Patent
1978-11-20
1981-03-03
Stallard, W.
Measuring, testing, or signalling instruments
Security or signal instrument or casing
Aural, i.e., audible
D1006
Patent
active
D02584247
REFERENCES:
patent: D181376 (1957-11-01), Smith
Stallard W.
V. & E. Friedland Limited
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