US2994155A
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Toy device for launching rotary wing flying objects
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US1640516A
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Electrical protective apparatus
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US1488936A
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High-potential electricity-arrester electrode
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US1503285A
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Process of producing uniform voltaic cells
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US1503284A
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High-potential-electricity arrester
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US1446720A
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Process of treating electrical resistances to stabilize their resistance
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US1252942A
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Electrical protector.
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US1408632A
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Relay
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US1238728A
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Combined lightning-arrester and thermal protector.
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US1226617A
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Electromagnet.
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US1366095A
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Voltaic cell and electrode
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US1468574A
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Voltaic cell
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US1182202A
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Voltaic cell and battery.
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US1179380A
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High-potential electricity-arrester.
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US1405935A
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Mounting plate for electrical protective apparatus
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US1245014A
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Electrical protective apparatus.
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US1259901A
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Relay.
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US1333771A
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Voltaic cell and battery
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US1121282A
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Gas-cock.
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US1106108A
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Safety-valve.
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