Geophone

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Item Geophone
Item code
Description
Manufacturer
Circa
Model
Donor Charlie Klutts
Location HGC
Serial number NMI-7"NMI" can not be assigned to a declared number type with value -7.
Taxonomy IMG2158
  1. 7 & #8. NMI. Two units of similar construction but different size. Both units have numbers stamped on brass plug entry: #7 has 3540 on top and #8 has 2530 on bottom. Bottom plates are attached with rivets. Removal of brass plug exposes soldered connections.

GSH IMG2158.jpg