4. H - Electricity
  5. 01
  6. H

Robert J. Johnston

H - Electricity – 01 – H

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Adjustable magnetic latch for a relay

H - Electricity – 01 – H
Patent

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Coal-based organic growth compound

C - Chemistry – Metallurgy – 05 – F
Patent

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Combined reciprocally and rotatively actuated selector switch

H - Electricity – 01 – H
Patent

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Convertible momentary/maintained electric switch

H - Electricity – 01 – H
Patent

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Convertible selector switch

H - Electricity – 01 – H
Patent

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Liquid metering device

G - Physics – 01 – F
Patent

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Wall board

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Patent

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Profile ID: LFCA-PAI-P-9326

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