# Relationship history for MSHA mine 4607348

Current hierarchy: **Cline Rex → Boone Minerals Inc → Sequoia #4**

- 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:** Coal Power Coal Company Inc → Sequoia #4; 1987-08-01 to 1988-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Powers Melvin → Sequoia #4; 1987-08-01 to 1988-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Powers Melvin → Coal Power Coal Company Inc; 1987-08-01 to 1988-01-28; source msha-controller-operator-history
- **operator_operates_mine:** Charmine Energy Corp → Sequoia #4; 1988-01-29 to 1988-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Fields Glenn E → Sequoia #4; 1988-01-29 to 1988-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Fields Glenn E → Charmine Energy Corp; 1988-01-29 to 1988-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Boone Minerals Inc → Sequoia #4; 1988-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cline Rex Et Al → Sequoia #4; 1988-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cline Rex Et Al → Boone Minerals Inc; 1988-07-12 to current/open; source msha-controller-operator-history