# Relationship history for MSHA mine 2501011

Current hierarchy: **Jansen Rich → Platte Valley Sand & Gravel → Pit #4**

- 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:** City Wide Rock & Excavating Inc → Pit #4; 1981-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** City Wide Sand & Gravel Inc → Pit #4; 1983-08-01 to 1985-03-11; source msha-controller-operator-history
- **controller_controls_operator:** City Wide Rock & Excavating Inc → City Wide Sand & Gravel Inc; 1983-08-01 to 1985-03-11; source msha-controller-operator-history
- **operator_operates_mine:** Platte Valley Sand & Gravel → Pit #4; 1985-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jansen Rich → Pit #4; 1985-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jansen Rich → Platte Valley Sand & Gravel; 1985-03-12 to current/open; source msha-controller-operator-history