# Relationship history for MSHA mine 1511043

Current hierarchy: **Partin Wayland → D & L Coal Company → No 2 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

- **controller_controls_mine:** Partin Wayland Et Al → No 2 Strip; 1977-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D & L Coal Company → No 2 Strip; 1978-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Partin Wayland Et Al → D & L Coal Company; 1978-02-01 to current/open; source msha-controller-operator-history