# Relationship history for MSHA mine 0301232

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

- 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:** R & R Gravel Inc → Radix Quarries; 1950-01-01 to 1991-03-17; source msha-controller-operator-history
- **controller_controls_mine:** T D  Russell → Radix Quarries; 1950-01-01 to 1991-03-17; source msha-controller-operator-history
- **controller_controls_operator:** T D  Russell → R & R Gravel Inc; 1950-01-01 to 1991-03-17; source msha-controller-operator-history
- **operator_operates_mine:** Carroll County Stone Inc → Radix Quarries; 1991-03-18 to 2023-03-31; source msha-controller-operator-history
- **controller_controls_mine:** David E  Bailey  et al → Radix Quarries; 1991-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David E  Bailey  et al → Carroll County Stone Inc; 1991-03-18 to 2023-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Radix Carroll County → Radix Quarries; 2023-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Springfield Underground, Inc. DBA Erlen Group → Radix Quarries; 2023-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Springfield Underground, Inc. DBA Erlen Group → Radix Carroll County; 2023-04-01 to current/open; source msha-controller-operator-history