# Relationship history for MSHA mine 0301822

Current hierarchy: **Summit Materials LLC → Razor Rock Materials Company → BAY RD**

- 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:** W Kent  Ingram → BAY RD; 1986-01-01 to 2017-02-26; source msha-controller-operator-history
- **operator_operates_mine:** Razor Rock Materials Company → BAY RD; 2000-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W Kent  Ingram → Razor Rock Materials Company; 2000-05-01 to 2017-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → BAY RD; 2017-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Razor Rock Materials Company; 2017-02-27 to current/open; source msha-controller-operator-history