# Relationship history for MSHA mine 1001269

Current hierarchy: **Lloyd G  Merrill → J K Merrill & Sons, Inc. → Merrill 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:** M G Curtis Company Inc → Merrill Pit; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **controller_controls_mine:** M G  Curtis → Merrill Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** M G  Curtis → M G Curtis Company Inc; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **operator_operates_mine:** J K Merrill & Sons, Inc. → Merrill Pit; 1979-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** George T  Merrill  et al → Merrill Pit; 1979-04-01 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_operator:** George T  Merrill  et al → J K Merrill & Sons, Inc.; 1979-04-01 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Lloyd G  Merrill → Merrill Pit; 2016-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lloyd G  Merrill → J K Merrill & Sons, Inc.; 2016-01-01 to current/open; source msha-controller-operator-history