# Relationship history for MSHA mine 0405007

Current hierarchy: **John J Buick → Trinity Sand and Gravel → Smith 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:** Robert  Robison Et Al → Smith Pit; 1987-09-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coffee Creek Trinity Sand & Gravel Inc → Smith Pit; 1989-01-01 to 1991-08-05; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Robison Et Al → Coffee Creek Trinity Sand & Gravel Inc; 1989-01-01 to 1991-08-05; source msha-controller-operator-history
- **operator_operates_mine:** Concrete Aggregates Products Inc → Smith Pit; 1991-08-06 to 2018-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Jerry  Sanders  et al → Smith Pit; 1991-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Sanders  et al → Concrete Aggregates Products Inc; 1991-08-06 to 2018-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Clint  Robison  et al → Concrete Aggregates Products Inc; 1991-08-06 to 2018-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Trinity Sand and Gravel → Smith Pit; 2018-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John J Buick → Smith Pit; 2018-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John J Buick → Trinity Sand and Gravel; 2018-05-02 to current/open; source msha-controller-operator-history