Bell BGM-3

 (MI_Instrument) uuid: c3f7efa2-cb32-46b7-a9ae-d8038c14960c
    citation:  (CI_Citation)
        title:   Bell BGM-3 gravimeter
        date:  (CI_Date)
            date:   2017-02-15
            dateType:  inapplicable
        identifier:  (MD_Identifier)
            code:   R2R:MODEL:100081
    identifier:  (MD_Identifier)
        code:   Bell BGM-3
    type:   gravimeter