# Relationship history for MSHA mine 1900566

Current hierarchy: **Henry J  Zola → Gravel Pit Inc → GRAVEL PIT INCORPORATED**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Edward Lindsay & Sons Inc → GRAVEL PIT INCORPORATED; 1950-01-01 to 1979-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Lindsay Edward & Sons Inc → GRAVEL PIT INCORPORATED; 1950-01-01 to 1979-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Lindsay Edward & Sons Inc → Edward Lindsay & Sons Inc; 1950-01-01 to 1979-09-30; source msha-controller-operator-history
- **operator_operates_mine:** New England Stone & Sand Inc → GRAVEL PIT INCORPORATED; 1979-10-01 to 1982-11-08; source msha-controller-operator-history
- **controller_controls_mine:** Joseph  Cardoso → GRAVEL PIT INCORPORATED; 1979-10-01 to 1982-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Cardoso → New England Stone & Sand Inc; 1979-10-01 to 1982-11-08; source msha-controller-operator-history
- **operator_operates_mine:** Gravel Pit Inc → GRAVEL PIT INCORPORATED; 1982-11-09 to 1989-10-04; source msha-controller-operator-history
- **controller_controls_mine:** Clare  De Santis  et al → GRAVEL PIT INCORPORATED; 1982-11-09 to 1989-10-04; source msha-controller-operator-history
- **controller_controls_operator:** Clare  De Santis  et al → Gravel Pit Inc; 1982-11-09 to 1989-10-04; source msha-controller-operator-history
- **operator_operates_mine:** Gravel Pit Inc → GRAVEL PIT INCORPORATED; 1989-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Henry J  Zola → GRAVEL PIT INCORPORATED; 1989-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henry J  Zola → Gravel Pit Inc; 1989-10-05 to current/open; source msha-controller-operator-history