# Relationship history for MSHA mine 4000041

Current hierarchy: **Phelps Walter → Phelps Limestone Company → Marmor 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** John J Craig Company → Marmor Quarry; 1950-01-01 to 1986-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Craig John J → Marmor Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig John J → John J Craig Company; 1950-01-01 to 1986-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Candoro Marble & Granite Company Inc → Marmor Quarry; 1986-04-01 to 1989-11-12; source msha-controller-operator-history
- **controller_controls_mine:** Harjess Victor → Marmor Quarry; 1986-04-01 to 1989-11-12; source msha-controller-operator-history
- **controller_controls_operator:** Harjess Victor → Candoro Marble & Granite Company Inc; 1986-04-01 to 1989-11-12; source msha-controller-operator-history
- **operator_operates_mine:** Phelps Limestone Company → Marmor Quarry; 1989-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Phelps Walter → Marmor Quarry; 1989-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phelps Walter → Phelps Limestone Company; 1989-11-13 to current/open; source msha-controller-operator-history