# Relationship history for MSHA mine 1900978

Current hierarchy: **Clare  De Santis → Ware River Development Corp → Airport 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

- **controller_controls_mine:** Joseph  Cardoso → Airport Pit; 1979-10-01 to 1982-11-08; source msha-controller-operator-history
- **operator_operates_mine:** New England Stone & Sand Inc → Airport Pit; 1979-12-01 to 1982-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Cardoso → New England Stone & Sand Inc; 1979-12-01 to 1982-11-08; source msha-controller-operator-history
- **operator_operates_mine:** Ware River Development Corp → Airport Pit; 1982-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clare  De Santis  et al → Airport Pit; 1982-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clare  De Santis  et al → Ware River Development Corp; 1982-11-09 to current/open; source msha-controller-operator-history