# Relationship history for MSHA mine 0301601

Current hierarchy: **Mc Caleb Johnnie → M & M Ready Mix Inc → Bear Creek Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Bear Creek Sand & Gravel → Bear Creek Sand & Gravel; 1985-07-01 to 1990-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Mc Mullen Jackie C → Bear Creek Sand & Gravel; 1985-07-01 to 1990-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Mc Mullen Jackie C → Bear Creek Sand & Gravel; 1985-07-01 to 1990-01-31; source msha-controller-operator-history
- **operator_operates_mine:** M & M Ready Mix Inc → Bear Creek Sand & Gravel; 1990-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Caleb Johnnie → Bear Creek Sand & Gravel; 1990-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Caleb Johnnie → M & M Ready Mix Inc; 1990-02-01 to current/open; source msha-controller-operator-history