Info

1/1956

Hammersirom et al. ...

310/168

2,816,240

12/1957

Zimmer

310/181 X

3,009.092

11/1961

Carmichael

322/17 X

3,010,040

11/1961

Braun

310/181 X

3.253,170

5/1966

Philips ei al

310/168

3,346,749

10/1967

Shafranek

310/181 X

3,512,026

5/1970

Tiltins

310/168

3,518.473

6/1970

Nordebo

310/168

3,569.804

3/197ยป

Studer

318/138

3,577.002

5/1971

Hall

. 310/240 X

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