# Relationship history for MSHA mine 0503116

Current hierarchy: **Hastings Robert M Sr → Hastings Construction Company → Hastings Strip 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:** Hastings Construction Company → Hastings Strip Mine; 1977-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hastings Robert M Sr → Hastings Strip Mine; 1977-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hastings Robert M Sr → Hastings Construction Company; 1977-10-01 to current/open; source msha-controller-operator-history