# Relationship history for MSHA mine 0405736

Current hierarchy: **Jorge  Santillian; Mike  Butler → Bangor Aggregates LLC → Bangor Quarry**

- 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:** Eric R  Ladd et al → Bangor Quarry; 1991-12-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Roy E Ladd Inc → Bangor Quarry; 2007-08-21 to 2015-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Eric R  Ladd et al → Roy E Ladd Inc; 2007-08-21 to 2015-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Bangor Rock LLC → Bangor Quarry; 2015-07-01 to 2022-10-23; source msha-controller-operator-history
- **controller_controls_mine:** Allan  Shufelberger → Bangor Quarry; 2015-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allan  Shufelberger → Bangor Rock LLC; 2015-07-01 to 2022-10-23; source msha-controller-operator-history
- **operator_operates_mine:** Bangor Aggregates LLC → Bangor Quarry; 2022-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jorge  Santillian et al → Bangor Quarry; 2022-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jorge  Santillian et al → Bangor Aggregates LLC; 2022-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Butler et al → Bangor Aggregates LLC; 2022-10-24 to current/open; source msha-controller-operator-history