# Relationship history for MSHA mine 3609062

Current hierarchy: **Brian A  Dwyer II; Brian A  Dwyer; Dennis J  Dwyer → Erie Aggregates Inc. → Troyer 2 Mine**

- 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:** Deborah A  Will → Troyer 2 Mine; 1992-04-02 to 2017-05-23; source msha-controller-operator-history
- **operator_operates_mine:** Erie Aggregates Inc. → Troyer 2 Mine; 2002-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deborah A  Will → Erie Aggregates Inc.; 2002-03-14 to 2017-05-23; source msha-controller-operator-history
- **controller_controls_mine:** Brian A  Dwyer et al → Troyer 2 Mine; 2017-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian A  Dwyer et al → Erie Aggregates Inc.; 2017-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian A  Dwyer II et al → Erie Aggregates Inc.; 2017-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis J  Dwyer et al → Erie Aggregates Inc.; 2017-05-24 to current/open; source msha-controller-operator-history