# Relationship history for MSHA mine 4201874

Current hierarchy: **CRH PLC → Staker & Parson Co. → Falcon Ridge**

- 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

- **controller_controls_mine:** Gaylord W  Gardner → Falcon Ridge; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W W & W B Gardner Inc → Falcon Ridge; 1984-04-01 to 1994-04-05; source msha-controller-operator-history
- **controller_controls_operator:** Gaylord W  Gardner → W W & W B Gardner Inc; 1984-04-01 to 1994-04-05; source msha-controller-operator-history
- **operator_operates_mine:** Falcon Ridge Construction → Falcon Ridge; 1994-04-06 to 1998-02-19; source msha-controller-operator-history
- **controller_controls_mine:** Kelly  Dawson → Falcon Ridge; 1994-04-06 to 1998-02-19; source msha-controller-operator-history
- **controller_controls_operator:** Kelly  Dawson → Falcon Ridge Construction; 1994-04-06 to 1998-02-19; source msha-controller-operator-history
- **operator_operates_mine:** Geodyne Beck Rock Products Inc → Falcon Ridge; 1998-02-20 to 2001-03-31; source msha-controller-operator-history
- **controller_controls_mine:** U S Aggregate Inc → Falcon Ridge; 1998-02-20 to 2001-03-31; source msha-controller-operator-history
- **controller_controls_operator:** U S Aggregate Inc → Geodyne Beck Rock Products Inc; 1998-02-20 to 2001-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Oldcastle Mmg Inc → Falcon Ridge; 2001-04-01 to 2006-12-11; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Falcon Ridge; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle Mmg Inc; 2001-04-01 to 2006-12-11; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Falcon Ridge; 2002-05-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Staker & Parson Co. → Falcon Ridge; 2006-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Staker & Parson Co.; 2006-12-12 to current/open; source msha-controller-operator-history