# Relationship history for MSHA mine 1700823

Current hierarchy: **Janet  McGillan → McGillan Incorporated → McGillan Quarry**

- 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:** McGillan Incorporated → McGillan Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fred G  McGillan Jr → McGillan Quarry; 2007-08-23 to 2014-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Fred G  McGillan Jr → McGillan Incorporated; 2007-08-23 to 2014-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Janet  McGillan → McGillan Quarry; 2014-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Janet  McGillan → McGillan Incorporated; 2014-07-26 to current/open; source msha-controller-operator-history