# Relationship history for MSHA mine 3304277

Current hierarchy: **Stock Robert M → B & S Mining → B&S Mining**

- 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:** B & S Mining → B&S Mining; 1992-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stock Robert M → B&S Mining; 1992-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stock Robert M → B & S Mining; 1992-07-01 to current/open; source msha-controller-operator-history