# Relationship history for MSHA mine 2100004

Current hierarchy: **Jacob  Barkley → Dakota Stone, Inc → BELLINGHAM 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

- **controller_controls_mine:** Richard  Dilts et al → BELLINGHAM QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Delano Granite Inc → BELLINGHAM QUARRY; 1950-01-01 to 1985-08-18; source msha-controller-operator-history
- **controller_controls_mine:** Cy  Zierden → BELLINGHAM QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cy  Zierden → Delano Granite Inc; 1950-01-01 to 1985-08-18; source msha-controller-operator-history
- **controller_controls_mine:** Tony J  Morris  et al → BELLINGHAM QUARRY; 1985-03-18 to 1986-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Georgia-Field Inc → BELLINGHAM QUARRY; 1985-08-19 to 1986-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Tony J  Morris  et al → Georgia-Field Inc; 1985-08-19 to 1986-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Field Granite International Ltd → BELLINGHAM QUARRY; 1986-10-15 to 1990-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Field Financial Corp → BELLINGHAM QUARRY; 1986-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Field Financial Corp → Field Granite International Ltd; 1986-10-15 to 1990-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Dakota Granite Company → BELLINGHAM QUARRY; 1990-05-01 to 2021-07-06; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Dilts et al → Dakota Granite Company; 1990-05-01 to 2021-07-06; source msha-controller-operator-history
- **operator_operates_mine:** Dakota Stone, Inc → BELLINGHAM QUARRY; 2021-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jacob  Barkley → BELLINGHAM QUARRY; 2021-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jacob  Barkley → Dakota Stone, Inc; 2021-07-07 to current/open; source msha-controller-operator-history