# Relationship history for MSHA mine 3503765

Current hierarchy: **Ronald D  Braxling → Braxling & Braxling, Inc. → Portable Crusher # 2**

- 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

- **controller_controls_mine:** Art  Braxling → Portable Crusher # 2; 1950-01-01 to 2014-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Braxling & Braxling, Inc. → Portable Crusher # 2; 2011-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Art  Braxling → Braxling & Braxling, Inc.; 2011-06-23 to 2014-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Ronald D  Braxling → Portable Crusher # 2; 2014-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald D  Braxling → Braxling & Braxling, Inc.; 2014-06-01 to current/open; source msha-controller-operator-history