# Relationship history for MSHA mine 0900949

Current hierarchy: **Hopper Johnny → K & C Coal Company Inc → K & C No 2**

- 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:** Hopper Johnny → K & C No 2; 1978-04-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K & C Coal Company Inc → K & C No 2; 1981-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hopper Johnny → K & C Coal Company Inc; 1981-12-01 to current/open; source msha-controller-operator-history