# Relationship history for MSHA mine 3604497

Current hierarchy: **Bulow Richard P → Glessner Mines → Glessner Mines**

- 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:** J S Glessner Mines → Glessner Mines; 1950-01-01 to 1977-02-06; source msha-controller-operator-history
- **controller_controls_mine:** Glessner James Stoy → Glessner Mines; 1950-01-01 to 1977-02-06; source msha-controller-operator-history
- **controller_controls_operator:** Glessner James Stoy → J S Glessner Mines; 1950-01-01 to 1977-02-06; source msha-controller-operator-history
- **operator_operates_mine:** Glessner Mines → Glessner Mines; 1977-02-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bulow Richard P → Glessner Mines; 1977-02-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bulow Richard P → Glessner Mines; 1977-02-07 to current/open; source msha-controller-operator-history