# Relationship history for MSHA mine 4001795

Current hierarchy: **Bridges Gary → Gary Bridges Logging & Coal Inc → #1 Strip**

- 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:** Gary Bridges Logging & Coal Inc → #1 Strip; 1975-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bridges Gary → #1 Strip; 1975-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bridges Gary → Gary Bridges Logging & Coal Inc; 1975-11-01 to current/open; source msha-controller-operator-history