# Relationship history for MSHA mine 4403509

Current hierarchy: **Williams L Roger → General Energy Corp → Surface Mine-No 1 Strip**

- 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:** Flat Top Mountain Coal Co Inc → Surface Mine-No 1 Strip; 1950-01-01 to 1976-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Cox Leon → Surface Mine-No 1 Strip; 1950-01-01 to 1976-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Cox Leon → Flat Top Mountain Coal Co Inc; 1950-01-01 to 1976-01-14; source msha-controller-operator-history
- **operator_operates_mine:** General Energy Corp → Surface Mine-No 1 Strip; 1976-01-15 to 1976-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Horne Charles J → Surface Mine-No 1 Strip; 1976-01-15 to 1976-05-15; source msha-controller-operator-history
- **controller_controls_operator:** Horne Charles J → General Energy Corp; 1976-01-15 to 1976-05-15; source msha-controller-operator-history
- **operator_operates_mine:** General Energy Corp → Surface Mine-No 1 Strip; 1976-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Williams L Roger → Surface Mine-No 1 Strip; 1976-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williams L Roger → General Energy Corp; 1976-05-16 to current/open; source msha-controller-operator-history