# Relationship history for MSHA mine 4300454

Current hierarchy: **Nick  Manosh → N. A. Manosh Inc → Walker Pit**

- 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:** Howard A  Manosh → Walker Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H. A. Manosh Corp. → Walker Pit; 1990-04-01 to 2019-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Howard A  Manosh → H. A. Manosh Corp.; 1990-04-01 to 2019-05-14; source msha-controller-operator-history
- **operator_operates_mine:** N. A. Manosh Inc → Walker Pit; 2019-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nick  Manosh → Walker Pit; 2019-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nick  Manosh → N. A. Manosh Inc; 2019-05-15 to current/open; source msha-controller-operator-history