# Relationship history for MSHA mine 0600323

Current hierarchy: **Christopher  Mc Laughlin → Soneco Service Inc → Ledyard Pit And 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Balf Company → Ledyard Pit And Plant; 1950-01-01 to 1978-04-30; source msha-controller-operator-history
- **controller_controls_mine:** H C  Savin → Ledyard Pit And Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** H C  Savin → Balf Company; 1950-01-01 to 1978-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Soneco Service Inc → Ledyard Pit And Plant; 1978-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Christopher  Mc Laughlin → Ledyard Pit And Plant; 1978-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christopher  Mc Laughlin → Soneco Service Inc; 1978-05-01 to current/open; source msha-controller-operator-history