# Relationship history for MSHA mine 0900766

Current hierarchy: **Darlene H  Dye → Granstone, Inc. → Granstone, Inc.**

- 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:** Regency Granite Company Inc → Granstone, Inc.; 1950-01-01 to 1981-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Felix  Comolli → Granstone, Inc.; 1950-01-01 to 1981-04-08; source msha-controller-operator-history
- **controller_controls_operator:** Felix  Comolli → Regency Granite Company Inc; 1950-01-01 to 1981-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Bob  Stevens → Granstone, Inc.; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Georgia-Carolina Quarries Inc → Granstone, Inc.; 1981-04-09 to 2002-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Bob  Stevens → Georgia-Carolina Quarries Inc; 1981-04-09 to 2002-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Darlene H  Dye  et al → Granstone, Inc.; 1986-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Granstone, Inc. → Granstone, Inc.; 2002-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darlene H  Dye  et al → Granstone, Inc.; 2002-07-22 to current/open; source msha-controller-operator-history