# Relationship history for MSHA mine 3301560

Current hierarchy: **Ronald E  Watson → Watson Gravel, Inc. → Watson Gravel Inc. (Middletown Plant)**

- 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

- **controller_controls_mine:** Ronald E  Watson → Watson Gravel Inc. (Middletown Plant); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Middletown Sand & Gravel Company → Watson Gravel Inc. (Middletown Plant); 1950-01-01 to 1987-09-23; source msha-controller-operator-history
- **controller_controls_mine:** R D  Stevens Jr → Watson Gravel Inc. (Middletown Plant); 1950-01-01 to 1987-09-23; source msha-controller-operator-history
- **controller_controls_operator:** R D  Stevens Jr → Middletown Sand & Gravel Company; 1950-01-01 to 1987-09-23; source msha-controller-operator-history
- **controller_controls_mine:** David T  Morgan → Watson Gravel Inc. (Middletown Plant); 1950-01-01 to 2005-05-17; source msha-controller-operator-history
- **operator_operates_mine:** Mecco Inc → Watson Gravel Inc. (Middletown Plant); 1987-09-24 to 2005-12-31; source msha-controller-operator-history
- **controller_controls_operator:** David T  Morgan → Mecco Inc; 1987-09-24 to 2005-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Ronald E  Watson → Watson Gravel Inc. (Middletown Plant); 2005-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald E  Watson → Mecco Inc; 2005-05-18 to 2005-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Watson Gravel, Inc. → Watson Gravel Inc. (Middletown Plant); 2006-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald E  Watson → Watson Gravel, Inc.; 2006-01-01 to current/open; source msha-controller-operator-history