# Relationship history for MSHA mine 3003146

Current hierarchy: **Joann  Dyer → Charles F Dyer & Sons Construction Inc → CHARLES F DYER & SONS**

- 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:** Charles F Dyer & Sons Construction Inc → CHARLES F DYER & SONS; 1995-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joann  Dyer → CHARLES F DYER & SONS; 1995-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joann  Dyer → Charles F Dyer & Sons Construction Inc; 1995-07-01 to current/open; source msha-controller-operator-history