{
  "schema": "lower-hose-connection-v1",
  "classification": "factory_lower_hose_role_with_estimated_hidden_return",
  "owner_dimensions_applied": false,
  "factory_sources": [
    "https://www.spridgets.de/downloads/Parts-1977.pdf#page=86",
    "https://www.spridgets.de/downloads/Parts-1977.pdf#page=88"
  ],
  "factory_branch_limits": "Plate86 lists GRH534 with its market/change-point scope; plate88 lists CHA603 for USA/Canada GAN6-166304-on. Neither is assigned as fitted to this1975 car. Earlier USA/Canada plumbing and TSB75-A-6 remain separate.",
  "owner_photo": "IMG_6896: local housing-end bend and clamp only; no complete calibrated radiator-end trace",
  "held_original_engine_hose_name": "lower_radiator_hose_visible_bend_owner_photo_provisional",
  "replaced_historical_radiator_hose_name": "radiator_lower_full_hose_route_comparison",
  "current_hose_name": "radiator_lower_complete_photo_bend_hose_reference",
  "retained_visible_endpoint_mm": [
    -186.0,
    -74.0,
    258.0
  ],
  "retained_terminal_tangent": [
    -0.248087233257295,
    -0.40082860345151106,
    0.8819235541416568
  ],
  "estimated_return_bezier_controls_mm": [
    [
      -186.0,
      -74.0,
      258.0
    ],
    [
      -205.8469786605836,
      -106.06628827612089,
      328.55388433133254
    ],
    [
      -288.5,
      -174.0,
      315.0
    ],
    [
      -288.5,
      -174.0,
      385.0
    ]
  ],
  "estimated_terminal_straight_mm": [
    [
      -288.5,
      -174.0,
      385.0
    ],
    [
      -288.5,
      -174.0,
      425.0
    ]
  ],
  "held_radiator_neck_mouth_mm": [
    -288.5,
    -174,
    403
  ],
  "held_radiator_neck_axis": [
    0,
    0,
    1
  ],
  "estimated_socket_engagement_mm": 22,
  "retained_hose_outside_inside_radius_mm": [
    21.5,
    17.5
  ],
  "sampled_return_centerline_minimum_radius_mm": 47.25220958146087,
  "estimated_bead_relief_radius_mm": 19.1,
  "source_sha256": {
    "radiator-photo-reference.json": "c5bbc25530ae9e7e22ecf7acef9878a7663a16d37a6d1ecdebd9008d9136e950",
    "radiator-photo-reference.step": "bff46a86ab8fbee036fbb1c21198667d4304cb81bffc1cc2bec5b6a195adc01f",
    "midget-1500-measured-core.json": "47059768d4dc759afc01c77e127b13a13c3727913f1564fa9d12c3bdaeaf5bd9",
    "midget-1500-measured-core.step": "8d3a2eef6419982a7444e60a1f0e72e1a487938bd89c833b3daaa39d62b4a7a9"
  },
  "limits": "Static reference connection only. Original local photo-guided bend/socket material is retained; the new hidden return and22mm unloaded radiator engagement are estimates between independently registered source endpoints. All inherited diameters and socket stations retain their original estimate/derived-comparison status. No fitted hose/radiator identity, actual cutting length, molded route, loaded clearance, seal/clamp compression, pressure behavior or replacement path is established. No endpoint or obstacle moves to remove intersections. Original lower full-route export stays historical. Pump/housing body registration, heater/expansion branches and unavailable USA cooling procedure pages remain unresolved."
}