# Relationship history for MSHA mine 0202953

Current hierarchy: **Terry L  Nolan → ABC Materials → Crusher #1**

- 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:** ABC Materials → Crusher #1; 2001-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Terry L  Nolan → Crusher #1; 2001-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry L  Nolan → ABC Materials; 2001-10-30 to current/open; source msha-controller-operator-history