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Method and apparatus for making and scanning spot patterns
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Method of simultaneously deforming two overlapping tubular metal elements to form interlocking ridges
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Method and apparatus for searching an inverted file information system
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Information handling system
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Examining-sorting systems
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Method and apparatus for storing on and retrieving information from multiple information strips
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Medical probing instrument having flexible, extrudable tubing adapted to be extraverted under pressure into a body cavity
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Information retrieval systems
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High voltage electrostatic demonstration apparatus
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Flue control devices adapted for combustion heaters
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Fluid control devices
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Microfilm apparatus
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Flue control devices adapted for combustion heaters
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Disposable ash receiver
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Tourmaline crystal elements for pressure gauges
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Amusement and educational device
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