# Relationship history for MSHA mine 2000764

Current hierarchy: **Christine  Hecht; Jerrad  Grinstead → American Aggregate, Inc. → Kiell Pit**

- 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

- **operator_operates_mine:** American Aggregate, Inc. → Kiell Pit; 1950-01-01 to 2002-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Kiell Excavating Company → Kiell Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kiell Excavating Company → American Aggregate, Inc.; 1950-01-01 to 2002-07-31; source msha-controller-operator-history
- **operator_operates_mine:** American Aggregate, Inc. → Kiell Pit; 2002-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Christine  Hecht  et al → Kiell Pit; 2002-08-01 to 2012-07-29; source msha-controller-operator-history
- **controller_controls_operator:** Christine  Hecht  et al → American Aggregate, Inc.; 2002-08-01 to 2012-07-29; source msha-controller-operator-history
- **controller_controls_operator:** Betty  Smith  et al → American Aggregate, Inc.; 2002-08-01 to 2012-07-29; source msha-controller-operator-history
- **controller_controls_mine:** Jerrad  Grinstead et al → Kiell Pit; 2012-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerrad  Grinstead et al → American Aggregate, Inc.; 2012-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christine  Hecht et al → American Aggregate, Inc.; 2012-07-30 to current/open; source msha-controller-operator-history