# Relationship history for MSHA mine 4703208

Current hierarchy: **Kyle  Frank; Timothy  Frank → Frank Brothers Inc → DREDGE ROHR**

- 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:** Donald E  Frank et al → DREDGE ROHR; 1950-01-01 to 2015-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Frank Brothers Inc → DREDGE ROHR; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald E  Frank et al → Frank Brothers Inc; 1999-07-01 to 2015-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Timothy  Frank et al → DREDGE ROHR; 2015-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy  Frank et al → Frank Brothers Inc; 2015-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kyle  Frank et al → Frank Brothers Inc; 2015-09-15 to current/open; source msha-controller-operator-history