# Relationship history for MSHA mine 3001295

Current hierarchy: **Kevin M Taylor; Mark  Taylor; Thomas A Taylor → HARLEM VALLEY SAND AND GRAVEL → HARLEM VALLEY SAND & GRAVEL**

- 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:** Cahill Industries Corp → HARLEM VALLEY SAND & GRAVEL; 1950-01-01 to 2013-05-28; source msha-controller-operator-history
- **controller_controls_mine:** Anthony B  Cahill → HARLEM VALLEY SAND & GRAVEL; 1950-01-01 to 2010-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Anthony B  Cahill → Cahill Industries Corp; 1950-01-01 to 2010-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Ian S  Holback → HARLEM VALLEY SAND & GRAVEL; 2010-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ian S  Holback → Cahill Industries Corp; 2010-07-12 to 2013-05-28; source msha-controller-operator-history
- **operator_operates_mine:** Harlem Valley Sand & Gravel, Inc. → HARLEM VALLEY SAND & GRAVEL; 2013-05-29 to 2022-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Ian S  Holback → HARLEM VALLEY SAND & GRAVEL; 2013-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ian S  Holback → Harlem Valley Sand & Gravel, Inc.; 2013-05-29 to 2022-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Harlem Valley Sand and Gravel → HARLEM VALLEY SAND & GRAVEL; 2022-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Taylor et al → HARLEM VALLEY SAND & GRAVEL; 2022-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Taylor et al → Harlem Valley Sand and Gravel; 2022-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas A Taylor et al → Harlem Valley Sand and Gravel; 2022-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin M Taylor et al → Harlem Valley Sand and Gravel; 2022-10-01 to current/open; source msha-controller-operator-history