# Relationship history for MSHA mine 2103183

Current hierarchy: **Peter G  Johnson → Hoover Construction Company → Spread #1**

- 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:** Hoover Construction Company → Spread #1; 1998-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Peter G  Johnson → Spread #1; 1998-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter G  Johnson → Hoover Construction Company; 1998-08-01 to current/open; source msha-controller-operator-history