# Relationship history for MSHA mine 1511511

Current hierarchy: **Maxie Carl & Warren → M & M Coal Company → No 1 Grading Plant**

- 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

- **controller_controls_mine:** Maxie Carl & Warren → No 1 Grading Plant; 1974-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M & M Coal Company → No 1 Grading Plant; 1978-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maxie Carl & Warren → M & M Coal Company; 1978-08-01 to current/open; source msha-controller-operator-history