# Relationship history for MSHA mine 4001675

Current hierarchy: **Blakeley Clendon → Gum Fork Energy Inc → No 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:** Ross Coal Company → No 1; 1974-07-01 to 1981-09-22; source msha-controller-operator-history
- **controller_controls_mine:** Ross Charles--Russell Wilson & R H Troxel → No 1; 1974-07-01 to 1981-09-22; source msha-controller-operator-history
- **controller_controls_operator:** Ross Charles--Russell Wilson & R H Troxel → Ross Coal Company; 1974-07-01 to 1981-09-22; source msha-controller-operator-history
- **operator_operates_mine:** Gum Fork Energy Inc → No 1; 1981-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blakeley Clendon → No 1; 1981-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blakeley Clendon → Gum Fork Energy Inc; 1981-09-23 to current/open; source msha-controller-operator-history