# Relationship history for MSHA mine 0504799

Current hierarchy: **Quikrete Holdings Inc. → QUIKRETE COMPANIES → Monarch 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Quikrete Holdings Inc. → Monarch Mill; 1998-09-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Monarch Mountain Marble Company LLC → Monarch Mill; 2004-09-03 to 2009-09-10; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Holloway → Monarch Mill; 2004-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Holloway → Monarch Mountain Marble Company LLC; 2004-09-03 to 2009-09-10; source msha-controller-operator-history
- **operator_operates_mine:** QUIKRETE COMPANIES → Monarch Mill; 2009-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quikrete Holdings Inc. → QUIKRETE COMPANIES; 2009-09-11 to current/open; source msha-controller-operator-history