# Relationship history for MSHA mine 4404479

Current hierarchy: **Nelson Kermit → Holly Beth Coal 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:** Black Widow Coal Company Inc → No 1; 1976-06-01 to 1983-08-23; source msha-controller-operator-history
- **controller_controls_mine:** Ernest E  Varney et al → No 1; 1976-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ernest E  Varney et al → Black Widow Coal Company Inc; 1976-06-01 to 1983-08-23; source msha-controller-operator-history
- **operator_operates_mine:** Holly Beth Coal Inc → No 1; 1983-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nelson Kermit → No 1; 1983-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nelson Kermit → Holly Beth Coal Inc; 1983-08-24 to current/open; source msha-controller-operator-history