# Relationship history for MSHA mine 2103159

Current hierarchy: **LaDon C Peterson → Peterson Sand & Gravel → PORTABLE 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

- **controller_controls_mine:** LaDon C Peterson → PORTABLE CRUSHER; 1991-07-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Peterson Sand & Gravel → PORTABLE CRUSHER; 1998-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** LaDon C Peterson → Peterson Sand & Gravel; 1998-05-01 to current/open; source msha-controller-operator-history