# Relationship history for MSHA mine 1514010

Current hierarchy: **Cain Billy B → Cain & Sons Inc → Cain No 4 Mine**

- 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

- **controller_controls_mine:** Cain Billy B → Cain No 4 Mine; 1979-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cain & Sons Inc → Cain No 4 Mine; 1983-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cain Billy B → Cain & Sons Inc; 1983-04-01 to current/open; source msha-controller-operator-history