# Relationship history for MSHA mine 4607943

Current hierarchy: **Jarvis Rick E → National Coal Inc → Surface #1**

- 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:** National Coal Inc → Surface #1; 1990-09-01 to 1991-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Fouch William → Surface #1; 1990-09-01 to 1991-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Fouch William → National Coal Inc; 1990-09-01 to 1991-10-14; source msha-controller-operator-history
- **operator_operates_mine:** National Coal Inc → Surface #1; 1991-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jarvis Rick E → Surface #1; 1991-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jarvis Rick E → National Coal Inc; 1991-10-15 to current/open; source msha-controller-operator-history