# Relationship history for MSHA mine 3301123

Current hierarchy: **Robert P  Thomas → Newbury Sand & Gravel Inc → Newbury Sand & Gravel Inc**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Newbury Sand & Gravel → Newbury Sand & Gravel Inc; 1993-04-01 to 2002-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Kaufman Blaine M → Newbury Sand & Gravel Inc; 1993-04-01 to 2003-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Kaufman Blaine M → Newbury Sand & Gravel; 1993-04-01 to 2002-05-31; source msha-controller-operator-history
- **operator_operates_mine:** T Coy Inc. → Newbury Sand & Gravel Inc; 2002-06-01 to 2003-08-03; source msha-controller-operator-history
- **controller_controls_mine:** EDWARD A  MC COY → Newbury Sand & Gravel Inc; 2002-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** EDWARD A  MC COY → T Coy Inc.; 2002-06-01 to 2003-08-03; source msha-controller-operator-history
- **controller_controls_operator:** JOE L  MC COY → T Coy Inc.; 2002-06-01 to 2003-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Robert P  Thomas et al → Newbury Sand & Gravel Inc; 2003-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert P  Thomas et al → Newbury Sand & Gravel; 2003-08-04 to 2002-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Newbury Sand & Gravel Inc → Newbury Sand & Gravel Inc; 2003-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert P  Thomas et al → Newbury Sand & Gravel Inc; 2003-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kaufman Blaine M → Newbury Sand & Gravel Inc; 2003-08-04 to 2003-08-03; source msha-controller-operator-history