# Relationship history for MSHA mine 4604245

Current hierarchy: **Stand Frank J → Mountain Energy Corp → No 2 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Mountain Energy Corp → No 2 Mine; 1974-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stand Frank J → No 2 Mine; 1974-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stand Frank J → Mountain Energy Corp; 1974-08-01 to current/open; source msha-controller-operator-history