Geophone 7Hz Model 6560-A

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Item Geophone 7Hz Model 6560-A
Item code
Description MQ1 6690 (Opened) Too
Manufacturer Hendricks-Ragan
Circa 1949
Donor E.E. Jones
Location Houston Geoscience Center
Serial number B6"B" can not be assigned to a declared number type with value 6.
Taxonomy GSH155A

Probably for earthquake monitoring. Note unique spring and arm assembly over the geophone coil and magnet.