# Relationship history for MSHA mine 3101843

Current hierarchy: **Colas S A → Larco Construction → AARON SAND & GRAVEL #2 MINE**

- 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

- **controller_controls_mine:** Philipp Holzmann A G → AARON SAND & GRAVEL #2 MINE; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rea Construction Company → AARON SAND & GRAVEL #2 MINE; 1979-01-01 to 1996-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Philipp Holzmann A G → Rea Construction Company; 1979-01-01 to 1996-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Sandra  Beeman → AARON SAND & GRAVEL #2 MINE; 1992-06-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Aaron Sand & Gravel Company → AARON SAND & GRAVEL #2 MINE; 1996-05-01 to 2000-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Sandra  Beeman → Aaron Sand & Gravel Company; 1996-05-01 to 2000-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Larco Construction → AARON SAND & GRAVEL #2 MINE; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → AARON SAND & GRAVEL #2 MINE; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Larco Construction; 2000-04-01 to current/open; source msha-controller-operator-history