# Relationship history for MSHA mine 1800756

Current hierarchy: **Brenda L Shank → Laoc Corporation → Laoc Strip #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Laoc Corporation → Laoc Strip #1; 2002-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James G  Shank → Laoc Strip #1; 2002-05-15 to 2014-07-06; source msha-controller-operator-history
- **controller_controls_operator:** James G  Shank → Laoc Corporation; 2002-05-15 to 2014-07-06; source msha-controller-operator-history
- **controller_controls_mine:** Brenda L Shank → Laoc Strip #1; 2014-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brenda L Shank → Laoc Corporation; 2014-07-07 to current/open; source msha-controller-operator-history