# Relationship history for MSHA mine 0103634

Current hierarchy: **Bobby  Johnson → K & B EARTH MATERIALS → BOOKER PIT**

- 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:** K & B Earth Materials → BOOKER PIT; 2025-11-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bobby  Johnson → BOOKER PIT; 2025-11-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bobby  Johnson → K & B Earth Materials; 2025-11-12 to current/open; source msha-controller-operator-history