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Browse Free Online Books and eBooks:
US Patent 2599212: Case for electrical measuring instruments
US Patent 2600343: Method of making conductive patterns
US Patent 2600817: Method and apparatus for photoelectrically assorting, recording, or computing
US Patent 2600828: Air miles recorder and follow-up system
US Patent 2600906: Projection apparatus for inspecting timepiece jewels
US Patent 2600928: Flame detector
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