Teaching aid for ultrasound wave theory

Details Teaching aid for ultrasound wave theory Teaching aid for ultrasound wave theory

1996-10-01

1998-12-22

Holtje, Martie K.

Office supplies; artists and teachers materials

Teaching material

D19 64, 1907

Patent

active

D04030184

REFERENCES:
patent: D24233 (1895-04-01), Stone
patent: D369185 (1996-04-01), Steele
patent: D377942 (1997-02-01), McClay
patent: 822783 (1906-06-01), Smith
patent: 1766355 (1930-06-01), Redman
patent: 2270120 (1942-01-01), Greene
patent: 2697234 (1954-12-01), Sturdevant
patent: 3404566 (1968-10-01), Cordova
patent: 3733708 (1973-05-01), Goodman
patent: 4058010 (1977-11-01), Woodhouse
patent: 4243223 (1981-01-01), Ver Hoef et al.
patent: 5343743 (1994-09-01), Chapman

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