Electrically-driven fork in "Elinvar" with patented screw adjustment for sliding weights
Electrically-driven fork in "Elinvar" with patented screw adjustment for sliding weights, (frequency 45r to about 90r) No. 65570.
Electrically-driven fork in "Elinvar" with patented screw adjustment for sliding weights, (frequency 45r to about 90r) No. 65570.