# Relationship history for MSHA mine 0600210

Current hierarchy: **Mc Cleary Sam → Waterbury Rock Inc → Waterbury Rock 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:** Colonial Sand & Gravel → Waterbury Rock Incorporated; 1950-01-01 to 1980-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth  Watterworth → Waterbury Rock Incorporated; 1950-01-01 to 1980-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth  Watterworth → Colonial Sand & Gravel; 1950-01-01 to 1980-08-03; source msha-controller-operator-history
- **operator_operates_mine:** Peckham-Colonial Sand & Gravel → Waterbury Rock Incorporated; 1980-08-04 to 1983-03-23; source msha-controller-operator-history
- **controller_controls_mine:** Peckham Charles → Waterbury Rock Incorporated; 1980-08-04 to 1983-03-23; source msha-controller-operator-history
- **controller_controls_operator:** Peckham Charles → Peckham-Colonial Sand & Gravel; 1980-08-04 to 1983-03-23; source msha-controller-operator-history
- **operator_operates_mine:** Waterbury Rock Inc → Waterbury Rock Incorporated; 1983-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Cleary Sam Et Al → Waterbury Rock Incorporated; 1983-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Cleary Sam Et Al → Waterbury Rock Inc; 1983-03-24 to current/open; source msha-controller-operator-history