# Relationship history for MSHA mine 4703906

Current hierarchy: **Daniel R  Thompson → BOB THOMPSON & SONS INC → Shop 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:** BOB THOMPSON & SONS INC → Shop Pit; 2021-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daniel R  Thompson → Shop Pit; 2021-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel R  Thompson → BOB THOMPSON & SONS INC; 2021-07-28 to current/open; source msha-controller-operator-history