# Relationship history for MSHA mine 2300954

Current hierarchy: **Springfield Underground, Inc. DBA Erlen Group → Radix Quarries → Radix Joplin**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Radix Quarries → Radix Joplin; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Louis A  Griesemer et al → Radix Joplin; 1950-01-01 to 2017-03-26; source msha-controller-operator-history
- **controller_controls_operator:** Louis A  Griesemer et al → Radix Quarries; 1950-01-01 to 2017-03-26; source msha-controller-operator-history
- **controller_controls_operator:** John F  Griesemer et al → Radix Quarries; 1950-01-01 to 2017-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Springfield Underground, Inc. DBA Erlen Group → Radix Joplin; 2017-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Springfield Underground, Inc. DBA Erlen Group → Radix Quarries; 2017-03-27 to current/open; source msha-controller-operator-history