# Relationship history for MSHA mine 2901874

Current hierarchy: **Turner Roy W → Ametex Corp → Elena No 2**

- 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

- **operator_operates_mine:** Ametex Corp → Elena No 2; 1982-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Turner Roy W → Elena No 2; 1982-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Turner Roy W → Ametex Corp; 1982-09-01 to current/open; source msha-controller-operator-history