# Relationship history for MSHA mine 4606049

Current hierarchy: **Hart Reuben F → Hilltop Service Company Inc → Coalbank Fork No 9**

- 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

- **controller_controls_mine:** Slaughter John I Et Al → Coalbank Fork No 9; 1978-11-01 to 1982-02-11; source msha-controller-operator-history
- **operator_operates_mine:** Pocahontas Second Limited Partnership → Coalbank Fork No 9; 1979-08-01 to 1982-02-11; source msha-controller-operator-history
- **controller_controls_operator:** Slaughter John I Et Al → Pocahontas Second Limited Partnership; 1979-08-01 to 1982-02-11; source msha-controller-operator-history
- **operator_operates_mine:** Maya Energies Inc → Coalbank Fork No 9; 1982-02-12 to 1983-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Vargas Luis → Coalbank Fork No 9; 1982-02-12 to 1986-02-26; source msha-controller-operator-history
- **controller_controls_operator:** Vargas Luis → Maya Energies Inc; 1982-02-12 to 1983-03-06; source msha-controller-operator-history
- **operator_operates_mine:** Hilltop Service Company Inc → Coalbank Fork No 9; 1983-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hart Reuben F → Coalbank Fork No 9; 1983-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hart Reuben F → Hilltop Service Company Inc; 1983-03-07 to current/open; source msha-controller-operator-history