# Relationship history for MSHA mine 4606127

Current hierarchy: **Garland George Jr → Round Mountain Coal Company → Joe'S Knob Strip**

- 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:** I C M Carbomin International Corp → Joe'S Knob Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Garland George Jr → Joe'S Knob Strip; 1977-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Leckie Smokeless Coal Company → Joe'S Knob Strip; 1980-02-01 to 1980-07-13; source msha-controller-operator-history
- **controller_controls_operator:** I C M Carbomin International Corp → Leckie Smokeless Coal Company; 1980-02-01 to 1980-07-13; source msha-controller-operator-history
- **operator_operates_mine:** Round Mountain Coal Company → Joe'S Knob Strip; 1980-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Garland George Jr → Round Mountain Coal Company; 1980-07-14 to current/open; source msha-controller-operator-history