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Signature	Maker	Instruments	Comments	Location	References
JOHNSON, HENRY	England, c.1802,		invented a device for tracing spiral curves; devised deep sea pressure gauges and deep sea thermometers.	39 Crutched Friars, London.	USNM.
JOHNSON, HENRY	England, c.1802,		invented a device for tracing spiral curves; devised deep sea pressure gauges and deep sea thermometers.	39 Crutched Friars, London.	USNM.

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