# Relationship history for MSHA mine 1519092

Current hierarchy: **CRH PLC → HINKLE CONTRACTING COMPANY LLC → PULASKI STONE COMPANY**

- 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:** Summit Materials LLC → PULASKI STONE COMPANY; 1950-01-01 to 2022-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Ron  Pfaff et al → PULASKI STONE COMPANY; 2001-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kay and Kay Contracting LLC → PULASKI STONE COMPANY; 2007-11-08 to 2012-10-07; source msha-controller-operator-history
- **controller_controls_operator:** Ron  Pfaff et al → Kay and Kay Contracting LLC; 2007-11-08 to 2012-10-07; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Robinson et al → Kay and Kay Contracting LLC; 2007-11-08 to 2012-10-07; source msha-controller-operator-history
- **operator_operates_mine:** Hinkle Contracting Company LLC → PULASKI STONE COMPANY; 2012-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Hinkle Contracting Company LLC; 2012-10-08 to 2022-05-13; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → PULASKI STONE COMPANY; 2022-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Hinkle Contracting Company LLC; 2022-05-14 to current/open; source msha-controller-operator-history