# Relationship history for MSHA mine 3603167

Current hierarchy: **Brian L  Carpenter → M & M Stone Company → M & M STONE CO.**

- 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:** Durnan & Good Inc → M & M STONE CO.; 1950-01-01 to 1987-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Margaret D  Pastor → M & M STONE CO.; 1950-01-01 to 1987-05-20; source msha-controller-operator-history
- **controller_controls_operator:** Margaret D  Pastor → Durnan & Good Inc; 1950-01-01 to 1987-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Brian L  Carpenter → M & M STONE CO.; 1979-12-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Delaware Valley Concrete Company Inc → M & M STONE CO.; 1987-05-21 to 1997-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Mario C  Diliberto → M & M STONE CO.; 1987-05-21 to 1997-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Mario C  Diliberto → Delaware Valley Concrete Company Inc; 1987-05-21 to 1997-10-31; source msha-controller-operator-history
- **operator_operates_mine:** M & M Stone Company → M & M STONE CO.; 1997-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian L  Carpenter → M & M Stone Company; 1997-11-01 to current/open; source msha-controller-operator-history