# Relationship history for MSHA mine 3608577

Current hierarchy: **David M  DeCristo → DeCristo Inc. → DUNBAR PIT**

- 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:** Dunbar Farm & Gravel → DUNBAR PIT; 1996-08-01 to 2018-05-29; source msha-controller-operator-history
- **controller_controls_mine:** Arthur  Dunbar Jr → DUNBAR PIT; 1996-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arthur  Dunbar Jr → Dunbar Farm & Gravel; 1996-08-01 to 2018-05-29; source msha-controller-operator-history
- **controller_controls_mine:** David M  DeCristo → DUNBAR PIT; 2010-05-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** DeCristo Inc. → DUNBAR PIT; 2018-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David M  DeCristo → DeCristo Inc.; 2018-05-30 to current/open; source msha-controller-operator-history