Number | Name | Date | Kind |
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4280206 | Guralp | Jul 1981 | A |
Number | Date | Country |
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286673 | Jan 1991 | DE |
Entry |
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E. Wielandt, Mechanical Receivers, Design Principles of Electronic Inertial Seismometers, pp. 354-355. No. 384, Institute of Geophysics. |
E. Wielandt et al., The Leaf-Spring Seismometer: Design and Performance, Buletin of the Seismological Society of America, Dec. 1982, pp. 2349, 2353-2354, 2366-2367, vol. 72, No. 6. |