# Relationship history for MSHA mine 4003000

Current hierarchy: **Robert Wright Family Trust; James Wright Family Trust at al; Robert  Wri → Wright Brothers Const. Co., Inc. → Old Fort 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:** S & S Rock, Inc. → Old Fort Quarry; 1989-01-01 to 2020-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Joyce L  Stafford → Old Fort Quarry; 1989-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joyce L  Stafford → S & S Rock, Inc.; 1989-01-01 to 2020-03-13; source msha-controller-operator-history
- **operator_operates_mine:** Wright Brothers Const. Co., Inc. → Old Fort Quarry; 2020-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Wright et al → Old Fort Quarry; 2020-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Wright et al → Wright Brothers Const. Co., Inc.; 2020-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert Wright Family Trust et al → Wright Brothers Const. Co., Inc.; 2020-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James Wright Family Trust at al → Wright Brothers Const. Co., Inc.; 2020-03-14 to current/open; source msha-controller-operator-history