# Relationship history for MSHA mine 4607504

Current hierarchy: **Crane James Douglas → Mohigan Mining Company → Mohigan Docks**

- 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:** Hardesty John R Jr-Larry A Myers Et Al → Mohigan Docks; 1986-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mohigan Mining Company Inc → Mohigan Docks; 1988-04-01 to 1991-05-20; source msha-controller-operator-history
- **controller_controls_operator:** Hardesty John R Jr-Larry A Myers Et Al → Mohigan Mining Company Inc; 1988-04-01 to 1991-05-20; source msha-controller-operator-history
- **operator_operates_mine:** Mohigan Mining Company → Mohigan Docks; 1991-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Crane James Douglas → Mohigan Docks; 1991-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crane James Douglas → Mohigan Mining Company; 1991-05-21 to current/open; source msha-controller-operator-history