# Relationship history for MSHA mine 0301487

Current hierarchy: **Earnest Larry J → L J Earnest Inc → L J Earnest Gravel Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** South Arkansas Gravel Company Inc → L J Earnest Gravel Plant; 1980-03-01 to 1985-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Richardson R D → L J Earnest Gravel Plant; 1980-03-01 to 1985-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Richardson R D → South Arkansas Gravel Company Inc; 1980-03-01 to 1985-03-13; source msha-controller-operator-history
- **operator_operates_mine:** L J Earnest Inc → L J Earnest Gravel Plant; 1985-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Earnest Larry J → L J Earnest Gravel Plant; 1985-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Earnest Larry J → L J Earnest Inc; 1985-03-14 to current/open; source msha-controller-operator-history