# Relationship history for MSHA mine 2700459

Current hierarchy: **Andrew C  Julian; Jason B  Julian → Julian Materials LLC → Unity Stone 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:** Unity Stone Quarry → Unity Stone Quarry; 2012-10-10 to 2023-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Douglas G  Rowe → Unity Stone Quarry; 2012-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas G  Rowe → Unity Stone Quarry; 2012-10-10 to 2023-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Jason B  Julian et al → Unity Stone Quarry; 2017-10-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Julian Materials LLC → Unity Stone Quarry; 2023-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason B  Julian et al → Julian Materials LLC; 2023-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew C  Julian et al → Julian Materials LLC; 2023-04-23 to current/open; source msha-controller-operator-history