# Relationship history for MSHA mine 2401967

Current hierarchy: **Kathleen K Remp → Remp Sand & Gravel Inc → CRUSHER #3**

- 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:** Remp Sand & Gravel → CRUSHER #3; 1992-05-01 to 1999-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Raymond H  Remp → CRUSHER #3; 1992-05-01 to 1999-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Raymond H  Remp → Remp Sand & Gravel; 1992-05-01 to 1999-08-01; source msha-controller-operator-history
- **operator_operates_mine:** Remp Sand & Gravel Inc → CRUSHER #3; 1999-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald  Remp et al → CRUSHER #3; 1999-08-02 to 2018-06-12; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  Remp et al → Remp Sand & Gravel Inc; 1999-08-02 to 2018-06-12; source msha-controller-operator-history
- **controller_controls_operator:** Russell  Remp et al → Remp Sand & Gravel Inc; 1999-08-02 to 2018-06-12; source msha-controller-operator-history
- **controller_controls_mine:** Kathleen K Remp → CRUSHER #3; 2018-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kathleen K Remp → Remp Sand & Gravel Inc; 2018-06-13 to current/open; source msha-controller-operator-history