# Relationship history for MSHA mine 3502784

Current hierarchy: **Craig  Duvall → Jdh Construction Ltd → JDH CONSTRUCTION LTD**

- 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:** Newburg Sand & Gravel → JDH CONSTRUCTION LTD; 1950-01-01 to 1986-03-27; source msha-controller-operator-history
- **controller_controls_mine:** Newburg Sand & Gravel → JDH CONSTRUCTION LTD; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Newburg Sand & Gravel → Newburg Sand & Gravel; 1950-01-01 to 1986-03-27; source msha-controller-operator-history
- **operator_operates_mine:** Newberg Sand & Gravel Company → JDH CONSTRUCTION LTD; 1986-03-28 to 1999-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Burch West Inc → JDH CONSTRUCTION LTD; 1986-03-28 to 1999-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Burch West Inc → Newberg Sand & Gravel Company; 1986-03-28 to 1999-07-21; source msha-controller-operator-history
- **operator_operates_mine:** Jdh Construction Ltd → JDH CONSTRUCTION LTD; 1999-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Craig  Duvall → JDH CONSTRUCTION LTD; 1999-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig  Duvall → Jdh Construction Ltd; 1999-07-22 to current/open; source msha-controller-operator-history