# Relationship history for MSHA mine 4405637

Current hierarchy: **Osborne Michael → Trico Enterprises Inc → Strip #1**

- 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:** Gladeville Construction Company → Strip #1; 1981-05-01 to 1982-10-06; source msha-controller-operator-history
- **controller_controls_mine:** Osborne Gerald → Strip #1; 1981-05-01 to 1982-10-06; source msha-controller-operator-history
- **controller_controls_operator:** Osborne Gerald → Gladeville Construction Company; 1981-05-01 to 1982-10-06; source msha-controller-operator-history
- **operator_operates_mine:** Trico Enterprises Inc → Strip #1; 1982-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Osborne Michael → Strip #1; 1982-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Osborne Michael → Trico Enterprises Inc; 1982-10-07 to current/open; source msha-controller-operator-history