Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Geometric
Patent
1992-07-10
1994-04-12
Douglas, Alan P.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Geometric
Patent
active
D03459292
REFERENCES:
patent: D223723 (1972-05-01), Thompson
patent: 3300864 (1967-01-01), Lesslie
Oculus of America's advertisement of earlier prototype of inventor's exophthalmometer (pre-1992) p. 73 of ophthalmometry text showing Hertel exophthalmometer (FIG. 79.1).
Areaux Raymond G.
Brignac Len R.
Davis Antoine D.
Douglas Alan P.
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