# Relationship history for MSHA mine 0101896

Current hierarchy: **Highlands Coal & Chemical Corp → Tennessee Highlands Coal Company Inc → Cherokee No 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

- **controller_controls_mine:** Brown Boyce & J E → Cherokee No 4; 1976-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Highlands Coal & Chemical Corp → Cherokee No 4; 1978-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brown Brothers Coal Company Inc → Cherokee No 4; 1978-06-01 to 1979-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Brown Boyce & J E → Brown Brothers Coal Company Inc; 1978-06-01 to 1979-03-29; source msha-controller-operator-history
- **operator_operates_mine:** Tennessee Highlands Coal Company Inc → Cherokee No 4; 1979-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Highlands Coal & Chemical Corp → Tennessee Highlands Coal Company Inc; 1979-03-30 to current/open; source msha-controller-operator-history