# Relationship history for MSHA mine 4103812

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → Tehuacana 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

- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Tehuacana Quarry; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Smith Crushed Stone → Tehuacana Quarry; 1994-03-01 to 1997-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Buster et al → Tehuacana Quarry; 1994-03-01 to 2011-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Buster et al → Smith Crushed Stone; 1994-03-01 to 1997-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Eddie G  Smith et al → Smith Crushed Stone; 1994-03-01 to 1997-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → Tehuacana Quarry; 1997-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 1997-11-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Tehuacana Quarry; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Construction Materials, LLC; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Tehuacana Quarry; 2011-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Smith Crushed Stone; 2011-02-01 to 1997-10-31; source msha-controller-operator-history