# Relationship history for MSHA mine 1700564

Current hierarchy: **John J  Lander Jr → Maine & New Hampshire Granite Corp → Crotch Island Quarry**

- 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

- **controller_controls_mine:** John J  Lander Jr → Crotch Island Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Maine & New Hampshire Granite Corp → Crotch Island Quarry; 1981-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John J  Lander Jr → Maine & New Hampshire Granite Corp; 1981-08-01 to current/open; source msha-controller-operator-history