# Relationship history for MSHA mine 1102349

Current hierarchy: **Lafarge S A → Joliet Sand & Gravel Company → Rockdale Quarry**

- 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:** Joliet Sand & Gravel Company → Rockdale Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rein Schultz & Dahl of Illinois Inc  et al → Rockdale Quarry; 1950-01-01 to 2006-04-08; source msha-controller-operator-history
- **controller_controls_operator:** Rein Schultz & Dahl of Illinois Inc  et al → Joliet Sand & Gravel Company; 1950-01-01 to 2006-04-08; source msha-controller-operator-history
- **controller_controls_operator:** George L Comerford  et al → Joliet Sand & Gravel Company; 1950-01-01 to 2006-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Rockdale Quarry; 2006-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Joliet Sand & Gravel Company; 2006-04-09 to current/open; source msha-controller-operator-history