# Relationship history for MSHA mine 1511748

Current hierarchy: **Petersville Sleigh Ltd → Alla Coal Corp → No 14**

- 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:** Petersville Sleigh Ltd Et Al → No 14; 1977-03-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alla Coal Corp → No 14; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Petersville Sleigh Ltd Et Al → Alla Coal Corp; 1978-12-01 to current/open; source msha-controller-operator-history