# Relationship history for MSHA mine 1200755

Current hierarchy: **Nancy  O'Mara; Daniel J  O'Mara → Spray Sand & Gravel → Spray Inc. dba Spray Sand & Gravel**

- 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:** Spray Sand & Gravel Inc → Spray Inc. dba Spray Sand & Gravel; 1950-01-01 to 2006-01-31; source msha-controller-operator-history
- **controller_controls_mine:** William  Spray → Spray Inc. dba Spray Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Spray → Spray Sand & Gravel Inc; 1950-01-01 to 2006-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Spray Sand & Gravel → Spray Inc. dba Spray Sand & Gravel; 2006-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daniel J  O'Mara et al → Spray Inc. dba Spray Sand & Gravel; 2006-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel J  O'Mara et al → Spray Sand & Gravel; 2006-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nancy  O'Mara et al → Spray Sand & Gravel; 2006-02-01 to current/open; source msha-controller-operator-history