# Relationship history for MSHA mine 4201723

Current hierarchy: **Demar  Boren → Demar Boren Contractor → Harrison No 10**

- 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:** Demar  Boren → Harrison No 10; 1978-08-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D C W & Company → Harrison No 10; 1981-03-01 to 1982-03-07; source msha-controller-operator-history
- **controller_controls_mine:** Watson D Clay-E Jay Cumming Et Al → Harrison No 10; 1981-03-01 to 1982-03-07; source msha-controller-operator-history
- **controller_controls_operator:** Watson D Clay-E Jay Cumming Et Al → D C W & Company; 1981-03-01 to 1982-03-07; source msha-controller-operator-history
- **operator_operates_mine:** Demar Boren Contractor → Harrison No 10; 1982-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Demar  Boren → Demar Boren Contractor; 1982-03-08 to current/open; source msha-controller-operator-history