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US Patent 2600142: Electron-discharge tube
US Patent 2600226: Device to minimize interference between dial impulses in a carrier system
US Patent 2600288: Frequency stabilizing apparatus
US Patent 2601427: Wave length modulator
US Patent 2601436: Frequency control apparatus
US Patent 2601473: Supervisory device both for comparatively small and comparatively large voltage variations
US Patent 2601719: Dry-shaving apparatus
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