# Relationship history for MSHA mine 2101118

Current hierarchy: **Matthew  Bryan → Bryan Rock Products Inc → Portable Plant 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

- **operator_operates_mine:** Bryan Rock Products Inc → Portable Plant 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William J  Bryan → Portable Plant 2; 1950-01-01 to 2023-10-09; source msha-controller-operator-history
- **controller_controls_operator:** William J  Bryan → Bryan Rock Products Inc; 1950-01-01 to 2023-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Matthew  Bryan → Portable Plant 2; 2023-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew  Bryan → Bryan Rock Products Inc; 2023-10-10 to current/open; source msha-controller-operator-history