4. H - Electricity
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Vacuum tube amplifying apparatus

H - Electricity – 03 – K
Patent

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Vacuum tube apparatus

H - Electricity – 01 – J
Patent

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Vacuum tube carbon grid

H - Electricity – 01 – J
Patent

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Vacuum tube for electron optical imagery

H - Electricity – 01 – J
Patent

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Vacuum tube gas test apparatus

H - Electricity – 01 – J
Patent

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Vacuum tube heater idling circuit

H - Electricity – 04 – N
Patent

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Vacuum tube housing comprising a plurality of intermediate...

H - Electricity – 01 – J
Patent

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Vacuum tube oscillator

H - Electricity – 04 – B
Patent

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Vacuum tube socket

H - Electricity – 01 – R
Patent

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Vacuum tube socket

H - Electricity – 01 – R
Patent

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Vacuum tube socket

H - Electricity – 01 – R
Patent

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Vacuum tube system

H - Electricity – 03 – F
Patent

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Vacuum type circuit interrupter

H - Electricity – 01 – H
Patent

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Vacuum type circuit interrupter having improved contacts

H - Electricity – 01 – H
Patent

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Vacuum type circuit interrupter with a contact having...

H - Electricity – 01 – H
Patent

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Vacuum type electric circuit breaker

H - Electricity – 01 – H
Patent

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Vacuum type electric circuit breaker

H - Electricity – 01 – H
Patent

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Vacuum type electric circuit interrupter

H - Electricity – 01 – H
Patent

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Vacuum type electrical device

H - Electricity – 01 – H
Patent

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Vacuum vessel

H - Electricity – 01 – J
Patent

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