# Relationship history for MSHA mine 4604977

Current hierarchy: **Bailey Robert → Sunnyside Coal Corp → #12-A 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:** Mc Kee Kenneth Et Al → #12-A Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sunnyside Coal Corp → #12-A Mine; 1975-12-03 to 1979-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Mc Kee Kenneth Et Al → Sunnyside Coal Corp; 1975-12-03 to 1979-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Sunnyside Coal Corp → #12-A Mine; 1979-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bailey Robert → #12-A Mine; 1979-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bailey Robert → Sunnyside Coal Corp; 1979-02-01 to current/open; source msha-controller-operator-history