4. G - Physics
  5. 08
  6. B

B. Mcleod Robert

G - Physics – 08 – B

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Alarm circuit supervisory means

G - Physics – 08 – B
Patent

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Annunciator system

G - Physics – 08 – B
Patent

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Calling box

H - Electricity – 04 – M
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Combined telephone-telegraphy system

H - Electricity – 04 – M
Patent

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Profile ID: LFCA-PAI-P-735542

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