# Relationship history for MSHA mine 0102530

Current hierarchy: **Sims Ronnie → Southern Sand & Gravel Company → LENOX PIT**

- 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

- **controller_controls_mine:** Lambeth Fred W → LENOX PIT; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Red'S Sand & Gravel Company → LENOX PIT; 1983-02-01 to 1991-10-07; source msha-controller-operator-history
- **controller_controls_operator:** Lambeth Fred W → Red'S Sand & Gravel Company; 1983-02-01 to 1991-10-07; source msha-controller-operator-history
- **controller_controls_mine:** Sims Ronnie Et Al → LENOX PIT; 1991-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southern Sand & Gravel Company → LENOX PIT; 1991-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sims Ronnie Et Al → Southern Sand & Gravel Company; 1991-10-08 to current/open; source msha-controller-operator-history