# Relationship history for MSHA mine 2700233

Current hierarchy: **Ronald Wayne  MacLaren → Wholesale Manufacturing Inc → Groton Road Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Tacey Transport Corp → Groton Road Pit; 1979-01-01 to 1981-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Trebino Larry → Groton Road Pit; 1979-01-01 to 1981-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Trebino Larry → Tacey Transport Corp; 1979-01-01 to 1981-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Processed Rock & Gravel Inc → Groton Road Pit; 1981-05-01 to 1985-04-11; source msha-controller-operator-history
- **controller_controls_mine:** D M Holden Inc → Groton Road Pit; 1981-05-01 to 1985-04-11; source msha-controller-operator-history
- **controller_controls_operator:** D M Holden Inc → Processed Rock & Gravel Inc; 1981-05-01 to 1985-04-11; source msha-controller-operator-history
- **operator_operates_mine:** Wholesale Manufacturing Inc → Groton Road Pit; 1985-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald Wayne  MacLaren → Groton Road Pit; 1985-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald Wayne  MacLaren → Wholesale Manufacturing Inc; 1985-04-12 to current/open; source msha-controller-operator-history