# Relationship history for MSHA mine 1201435

Current hierarchy: **Tatlock Max → M & L Coal Company → Max Tatlock 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:** M & L Coal Company → Max Tatlock Mine; 1975-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tatlock Max → Max Tatlock Mine; 1975-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tatlock Max → M & L Coal Company; 1975-10-01 to current/open; source msha-controller-operator-history