# Relationship history for MSHA mine 4403816

Current hierarchy: **Grady  Keene → Ol Blu Coal Company Inc → No 1 Mine**

- 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:** Energy Coal Corp → No 1 Mine; 1973-01-01 to 1975-07-16; source msha-controller-operator-history
- **operator_operates_mine:** Energy Coal Corp → No 1 Mine; 1974-01-01 to 1975-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Energy Coal Corp → Energy Coal Corp; 1974-01-01 to 1975-06-06; source msha-controller-operator-history
- **operator_operates_mine:** O'Henry Coal Corp → No 1 Mine; 1975-06-07 to 1977-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Rash Russell → No 1 Mine; 1975-06-07 to 1977-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Rash Russell → O'Henry Coal Corp; 1975-06-07 to 1977-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Ol Blu Coal Company Inc → No 1 Mine; 1977-09-12 to 1979-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Thomas J → No 1 Mine; 1977-09-12 to 1979-01-25; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Thomas J → Ol Blu Coal Company Inc; 1977-09-12 to 1979-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Ol Blu Coal Company Inc → No 1 Mine; 1979-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Grady  Keene → No 1 Mine; 1979-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grady  Keene → Ol Blu Coal Company Inc; 1979-01-26 to current/open; source msha-controller-operator-history