# Relationship history for MSHA mine 4604809

Current hierarchy: **Mc Groary Fred → Baron Coals Company 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:** I & W Coal Company Inc → No 1; 1975-08-21 to 1978-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Vance Irene & Clarence F Wade → No 1; 1975-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vance Irene & Clarence F Wade → I & W Coal Company Inc; 1975-08-21 to 1978-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Sugar Tree Coal Company Inc → No 1; 1978-08-01 to 1982-06-03; source msha-controller-operator-history
- **controller_controls_mine:** Mills Edward → No 1; 1978-08-01 to 1982-06-03; source msha-controller-operator-history
- **controller_controls_operator:** Mills Edward → Sugar Tree Coal Company Inc; 1978-08-01 to 1982-06-03; source msha-controller-operator-history
- **operator_operates_mine:** Baron Coals Company Inc → No 1; 1982-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Groary Fred → No 1; 1982-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Groary Fred → Baron Coals Company Inc; 1982-06-04 to current/open; source msha-controller-operator-history