# Relationship history for MSHA mine 0102753

Current hierarchy: **Mills Charles E → Brookwood Sand & Gravel Inc → Howton 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Dunn Construction Company Inc → Howton Mine; 1987-11-01 to 1991-02-27; source msha-controller-operator-history
- **controller_controls_mine:** French J S M → Howton Mine; 1987-11-01 to 1992-02-29; source msha-controller-operator-history
- **controller_controls_operator:** French J S M → Dunn Construction Company Inc; 1987-11-01 to 1991-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Brookwood Contractors Inc → Howton Mine; 1991-02-28 to 1991-11-24; source msha-controller-operator-history
- **controller_controls_mine:** Duncan Kay → Howton Mine; 1991-02-28 to 1991-11-24; source msha-controller-operator-history
- **controller_controls_operator:** Duncan Kay → Brookwood Contractors Inc; 1991-02-28 to 1991-11-24; source msha-controller-operator-history
- **operator_operates_mine:** Dunn Construction Company Inc → Howton Mine; 1991-11-25 to 1992-02-29; source msha-controller-operator-history
- **controller_controls_operator:** French J S M → Dunn Construction Company Inc; 1991-11-25 to 1992-02-29; source msha-controller-operator-history
- **operator_operates_mine:** Brookwood Sand & Gravel Inc → Howton Mine; 1992-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mills Charles E → Howton Mine; 1992-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mills Charles E → Brookwood Sand & Gravel Inc; 1992-03-01 to current/open; source msha-controller-operator-history