# Relationship history for MSHA mine 3003027

Current hierarchy: **Emil J  Galasso → Cobleskill Stone Products Inc → Knapp Pit**

- 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:** Lafarge S A → Knapp Pit; 1990-07-26 to 1994-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Robertson Construction Materials → Knapp Pit; 1991-12-01 to 1994-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Robertson Construction Materials; 1991-12-01 to 1994-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Cobleskill Stone Products Inc → Knapp Pit; 1994-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Emil J  Galasso et al → Knapp Pit; 2001-11-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Emil J  Galasso et al → Cobleskill Stone Products Inc; 2001-11-23 to current/open; source msha-controller-operator-history