# Relationship history for MSHA mine 0102794

Current hierarchy: **Patricia W Esfeller; Michael W Esfeller → Coastal Sand & Gravel Inc → Boe Road 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

- **operator_operates_mine:** Southern States Sand & Gravel Company → Boe Road Pit; 1989-04-01 to 2001-02-07; source msha-controller-operator-history
- **controller_controls_mine:** Stephen B  Rockhold → Boe Road Pit; 1989-04-01 to 2001-02-07; source msha-controller-operator-history
- **controller_controls_operator:** Stephen B  Rockhold → Southern States Sand & Gravel Company; 1989-04-01 to 2001-02-07; source msha-controller-operator-history
- **operator_operates_mine:** Coastal Sand & Gravel Inc → Boe Road Pit; 2001-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael W Esfeller → Boe Road Pit; 2001-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael W Esfeller → Coastal Sand & Gravel Inc; 2001-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patricia W Esfeller → Coastal Sand & Gravel Inc; 2001-02-08 to current/open; source msha-controller-operator-history