# Relationship history for MSHA mine 0600783

Current hierarchy: **Matthew M  Brennan; Eric T  Brennan → JOHN J BRENNAN CONSTRUCTION COMPANY INC → JOHN J BRENNAN CONST CO #267 PORTABLE METSO CRUSHE**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** David R  Brennan  et al → JOHN J BRENNAN CONST CO #267 PORTABLE ME; 1985-01-01 to 2024-03-31; source msha-controller-operator-history
- **operator_operates_mine:** John J Brennan Construction Company Inc → JOHN J BRENNAN CONST CO #267 PORTABLE ME; 2014-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David R  Brennan  et al → John J Brennan Construction Company Inc; 2014-03-04 to 2024-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Eric T  Brennan → JOHN J BRENNAN CONST CO #267 PORTABLE ME; 2024-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eric T  Brennan → John J Brennan Construction Company Inc; 2024-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew M  Brennan → John J Brennan Construction Company Inc; 2024-04-01 to current/open; source msha-controller-operator-history