# Relationship history for MSHA mine 3001273

Current hierarchy: **Doug E  Brown → American Bluestone Llc → UNADILLA MINE & MILL**

- 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:** Heldeberg Bluestone Of Unadilla Inc → UNADILLA MINE & MILL; 1950-01-01 to 1999-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Paul F  Giebitz et al → UNADILLA MINE & MILL; 1950-01-01 to 1999-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Paul F  Giebitz et al → Heldeberg Bluestone Of Unadilla Inc; 1950-01-01 to 1999-11-30; source msha-controller-operator-history
- **operator_operates_mine:** American Bluestone Llc → UNADILLA MINE & MILL; 1999-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Darrenkamp John & Skip Mays → UNADILLA MINE & MILL; 1999-12-01 to 2004-04-27; source msha-controller-operator-history
- **controller_controls_operator:** Darrenkamp John & Skip Mays → American Bluestone Llc; 1999-12-01 to 2004-04-27; source msha-controller-operator-history
- **controller_controls_mine:** Doug E  Brown → UNADILLA MINE & MILL; 2004-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Doug E  Brown → American Bluestone Llc; 2004-04-28 to current/open; source msha-controller-operator-history