# Relationship history for MSHA mine 1516770

Current hierarchy: **Demski Lydia → Deer Path Corp → No 2 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

- **controller_controls_mine:** Demski Lydia → No 2 Mine; 1989-10-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Deer Path Corp → No 2 Mine; 1989-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Demski Lydia → Deer Path Corp; 1989-11-01 to current/open; source msha-controller-operator-history