Geophone

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Item Geophone
Item code
Description
Manufacturer
Circa
Model
Donor Charlie Klutts
Location HGC
Serial number NMI-4"NMI" can not be assigned to a declared number type with value -4.
Taxonomy IMG2155
  1. 4. NMI. Metal top is stamped 5230 and F88 is stamped on top of the two carrying eyelets. The number 315 is marked on the side of the permanent magnet. The case, at left, is made of a plastic material lined with ceramic.

GSH IMG2155.jpg