# Relationship history for MSHA mine 4604724

Current hierarchy: **Mc Million Virgil & Johnnie Kessler → K & M Coal Company → No 4 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Ephriam Creek Coal Company → No 4 Mine; 1974-01-01 to 1975-12-22; source msha-controller-operator-history
- **controller_controls_mine:** Mc Clung Harold C → No 4 Mine; 1974-01-01 to 1975-12-22; source msha-controller-operator-history
- **controller_controls_operator:** Mc Clung Harold C → Ephriam Creek Coal Company; 1974-01-01 to 1975-12-22; source msha-controller-operator-history
- **operator_operates_mine:** K & M Coal Company → No 4 Mine; 1975-12-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Million Virgil & Johnnie Kessler → No 4 Mine; 1975-12-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Million Virgil & Johnnie Kessler → K & M Coal Company; 1975-12-23 to current/open; source msha-controller-operator-history