طلبات امارات العربية

Geophone string (land string): 4x3 PARALLEL X SERIES, DBL, land string, 80.5 mtr in length, consisting of (12) geophons, natural frequency 10 Hertz, coil resistance 350 ohm, Damping 0.68 (+/- 5%) with tilt from 0° to 15°, moving mass 8.4g