# Relationship history for MSHA mine 1700944

Current hierarchy: **Polycor Inc → Swensen Granite Company LLC → North Jay White 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:** Robert  Pope → North Jay White Quarry; 1950-01-01 to 2016-09-20; source msha-controller-operator-history
- **operator_operates_mine:** Polycor New England Inc. → North Jay White Quarry; 2014-10-15 to 2026-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Polycor Inc → North Jay White Quarry; 2014-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Polycor Inc → Polycor New England Inc.; 2014-10-15 to 2026-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Polycor Inc → North Jay White Quarry; 2016-09-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Swensen Granite Company LLC → North Jay White Quarry; 2026-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Pope → Swensen Granite Company LLC; 2026-03-30 to 2016-09-20; source msha-controller-operator-history
- **controller_controls_operator:** Polycor Inc → Swensen Granite Company LLC; 2026-03-30 to current/open; source msha-controller-operator-history