# Relationship history for MSHA mine 0800888

Current hierarchy: **Lambeth Fred W → Red'S Sand & Gravel Company → Escambia County Pits**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Red'S Sand & Gravel Company → Escambia County Pits; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lambeth Fred W → Escambia County Pits; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lambeth Fred W → Red'S Sand & Gravel Company; 1978-03-09 to current/open; source msha-controller-operator-history