# Relationship history for MSHA mine 3605904

Current hierarchy: **Liperote John → Darmac Coal Inc → Darmac Strip West Lebanon**

- 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:** West Lebanon Coal Inc → Darmac Strip West Lebanon; 1976-02-01 to 1978-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Bartony Harry E → Darmac Strip West Lebanon; 1976-02-01 to 1978-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Bartony Harry E → West Lebanon Coal Inc; 1976-02-01 to 1978-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Liperote John Et Al → Darmac Strip West Lebanon; 1977-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Virginia Coal Company Inc → Darmac Strip West Lebanon; 1978-06-23 to 1979-10-03; source msha-controller-operator-history
- **controller_controls_mine:** Virginia Coal Company Inc → Darmac Strip West Lebanon; 1978-06-23 to 1979-10-03; source msha-controller-operator-history
- **controller_controls_operator:** Virginia Coal Company Inc → Virginia Coal Company Inc; 1978-06-23 to 1979-10-03; source msha-controller-operator-history
- **operator_operates_mine:** Darmac Coal Inc → Darmac Strip West Lebanon; 1979-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Liperote John Et Al → Darmac Coal Inc; 1979-10-04 to current/open; source msha-controller-operator-history