# Relationship history for MSHA mine 1515902

Current hierarchy: **Joseph Buck → J & J Company Inc → #2 (Auger)**

- 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:** J & J Company Inc → #2 (Auger); 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joseph Buck Et Al → #2 (Auger); 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph Buck Et Al → J & J Company Inc; 1987-01-01 to current/open; source msha-controller-operator-history