# Relationship history for MSHA mine 3608068

Current hierarchy: **Mosser Morgan H → Morgan Energy Company → Rykat 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:** Stoneybrook Energy Company → Rykat Mine; 1989-01-01 to 1990-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Vernon D  Richmond → Rykat Mine; 1989-01-01 to 1990-04-04; source msha-controller-operator-history
- **controller_controls_operator:** Vernon D  Richmond → Stoneybrook Energy Company; 1989-01-01 to 1990-04-04; source msha-controller-operator-history
- **operator_operates_mine:** Morgan Energy Company → Rykat Mine; 1990-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mosser Morgan H → Rykat Mine; 1990-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mosser Morgan H → Morgan Energy Company; 1990-04-05 to current/open; source msha-controller-operator-history