# Relationship history for MSHA mine 1515880

Current hierarchy: **Smith C Y → C Y Smith Inc → C Y Smith #8**

- 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:** Nilson M Darrell & Joseph Newey → C Y Smith #8; 1985-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith C Y → C Y Smith #8; 1986-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cumberland Processing Corp → C Y Smith #8; 1986-12-01 to 1987-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Nilson M Darrell & Joseph Newey → Cumberland Processing Corp; 1986-12-01 to 1987-08-04; source msha-controller-operator-history
- **operator_operates_mine:** Rayscott Mining → C Y Smith #8; 1987-08-05 to 1987-10-19; source msha-controller-operator-history
- **controller_controls_mine:** Phipps Ray Scott Et Al → C Y Smith #8; 1987-08-05 to 1987-10-19; source msha-controller-operator-history
- **controller_controls_operator:** Phipps Ray Scott Et Al → Rayscott Mining; 1987-08-05 to 1987-10-19; source msha-controller-operator-history
- **operator_operates_mine:** C Y Smith Inc → C Y Smith #8; 1987-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith C Y → C Y Smith Inc; 1987-10-20 to current/open; source msha-controller-operator-history