# Relationship history for MSHA mine 4605605

Current hierarchy: **Pittston Company → Elkay Mining Company → Elkay No 4b**

- 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:** Pittston Company → Elkay No 4b; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Elkay Mining Company → Elkay No 4b; 1977-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Elkay Mining Company; 1977-09-01 to current/open; source msha-controller-operator-history