# Relationship history for MSHA mine 4601952

Current hierarchy: **Cline Ted-Ed & Mark → Thunder Mountain Energy 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:** Island Creek Coal Company → No 1; 1950-01-01 to 1980-03-10; source msha-controller-operator-history
- **controller_controls_mine:** Occidental Petroleum Corp → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Occidental Petroleum Corp → Island Creek Coal Company; 1950-01-01 to 1980-03-10; source msha-controller-operator-history
- **controller_controls_mine:** Cline Lassie → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Red Rose Coal Company Inc → No 1; 1980-03-11 to 1983-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Cline Lassie → Red Rose Coal Company Inc; 1980-03-11 to 1983-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Thunder Mountain Energy Inc → No 1; 1983-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cline Ted-Ed & Mark Et Al → No 1; 1983-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cline Ted-Ed & Mark Et Al → Thunder Mountain Energy Inc; 1983-06-15 to current/open; source msha-controller-operator-history