# Relationship history for MSHA mine 1515001

Current hierarchy: **Joseph Edward K → Shackleford Mining 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Shackleford Mining Inc → No 1; 1984-12-01 to 1986-12-10; source msha-controller-operator-history
- **controller_controls_mine:** Shackleford Patrick → No 1; 1984-12-01 to 1986-12-10; source msha-controller-operator-history
- **controller_controls_operator:** Shackleford Patrick → Shackleford Mining Inc; 1984-12-01 to 1986-12-10; source msha-controller-operator-history
- **operator_operates_mine:** Shackleford Mining Inc → No 1; 1986-12-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joseph Edward K → No 1; 1986-12-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph Edward K → Shackleford Mining Inc; 1986-12-11 to current/open; source msha-controller-operator-history