# Relationship history for MSHA mine 0201924

Current hierarchy: **Bonnie J  Crick → Little B Mining Company Inc → Portable Crusher No C-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:** B B Bonner Jr Enterprises Inc → Portable Crusher No C-2; 1979-01-01 to 1987-05-21; source msha-controller-operator-history
- **controller_controls_mine:** Bonner B B Jr → Portable Crusher No C-2; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bonner B B Jr → B B Bonner Jr Enterprises Inc; 1979-01-01 to 1987-05-21; source msha-controller-operator-history
- **operator_operates_mine:** Little B Mining Company Inc → Portable Crusher No C-2; 1987-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bonnie J  Crick → Portable Crusher No C-2; 1987-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bonnie J  Crick → Little B Mining Company Inc; 1987-05-22 to current/open; source msha-controller-operator-history