# Relationship history for MSHA mine 1900650

Current hierarchy: **Christopher  Dauphinais → Dauphinais Concrete → Dauphinais Concrete**

- 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:** Pyne Sand & Stone Company Inc → Dauphinais Concrete; 1950-01-01 to 2026-05-31; source msha-controller-operator-history
- **controller_controls_mine:** James G  Pyne et al → Dauphinais Concrete; 1950-01-01 to 2019-01-09; source msha-controller-operator-history
- **controller_controls_operator:** James G  Pyne et al → Pyne Sand & Stone Company Inc; 1950-01-01 to 2019-01-09; source msha-controller-operator-history
- **controller_controls_mine:** Andrew F  Leonard → Dauphinais Concrete; 2019-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew F  Leonard → Pyne Sand & Stone Company Inc; 2019-01-10 to 2026-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Dauphinais Concrete → Dauphinais Concrete; 2026-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Christopher  Dauphinais → Dauphinais Concrete; 2026-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christopher  Dauphinais → Dauphinais Concrete; 2026-06-01 to current/open; source msha-controller-operator-history