# Relationship history for MSHA mine 2102970

Current hierarchy: **LaDon C Peterson → Peterson Sand & Gravel → Universal Crusher**

- 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:** Intex Crusher Rental → Universal Crusher; 1987-08-01 to 1991-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Bower Jim → Universal Crusher; 1987-08-01 to 1991-07-16; source msha-controller-operator-history
- **controller_controls_operator:** Bower Jim → Intex Crusher Rental; 1987-08-01 to 1991-07-16; source msha-controller-operator-history
- **operator_operates_mine:** Peterson Sand & Gravel → Universal Crusher; 1991-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** LaDon C Peterson → Universal Crusher; 1991-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** LaDon C Peterson → Peterson Sand & Gravel; 1991-07-17 to current/open; source msha-controller-operator-history