# Relationship history for MSHA mine 3608748

Current hierarchy: **Clarence B.  Shafer → Shafer Brothers Construction Inc → Fox/Gapen**

- 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:** Clarence B.  Shafer et al → Fox/Gapen; 1987-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shafer Brothers Construction Inc → Fox/Gapen; 1998-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clarence B.  Shafer et al → Shafer Brothers Construction Inc; 1998-09-01 to current/open; source msha-controller-operator-history