# Relationship history for MSHA mine 0400131

Current hierarchy: **Bill T  Dutra → Dutra Materials → Petaluma 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

- **operator_operates_mine:** Quarry Products Inc → Petaluma Quarry; 1950-01-01 to 1986-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Mary  Bottoms → Petaluma Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mary  Bottoms → Quarry Products Inc; 1950-01-01 to 1986-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Bill T  Dutra → Petaluma Quarry; 1986-05-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** American Rock & Asphalt Inc → Petaluma Quarry; 1986-10-01 to 1996-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Sam  Johnson  et al → Petaluma Quarry; 1986-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sam  Johnson  et al → American Rock & Asphalt Inc; 1986-10-01 to 1996-07-14; source msha-controller-operator-history
- **controller_controls_operator:** Ralph  Johnson  et al → American Rock & Asphalt Inc; 1986-10-01 to 1996-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Dutra Materials → Petaluma Quarry; 1996-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill T  Dutra → Dutra Materials; 1996-07-15 to current/open; source msha-controller-operator-history