diff --git a/src/wireviz/DataClasses.py b/src/wireviz/DataClasses.py
index 3877706..06d5a8d 100644
--- a/src/wireviz/DataClasses.py
+++ b/src/wireviz/DataClasses.py
@@ -6,7 +6,7 @@ from itertools import zip_longest
 from typing import Dict, List, Optional, Tuple, Union
 
 from wireviz.wv_colors import COLOR_CODES, Color, ColorMode, Colors, ColorScheme
-from wireviz.wv_helper import aspect_ratio, awg_equiv, int2tuple, mm2_equiv
+from wireviz.wv_helper import aspect_ratio, awg_equiv, mm2_equiv
 
 # Each type alias have their legal values described in comments - validation might be implemented in the future
 PlainText = str  # Text not containing HTML tags nor newlines
diff --git a/src/wireviz/Harness.py b/src/wireviz/Harness.py
index e5dc1da..46063d0 100644
--- a/src/wireviz/Harness.py
+++ b/src/wireviz/Harness.py
@@ -1,15 +1,12 @@
 # -*- coding: utf-8 -*-
 
 from dataclasses import dataclass
-from itertools import zip_longest
 from pathlib import Path
 
 from graphviz import Graph
 
-from wireviz import APP_NAME, APP_URL, __version__, wv_colors
 from wireviz.DataClasses import (
     Arrow,
-    ArrowDirection,
     ArrowWeight,
     Cable,
     Connector,
@@ -22,16 +19,9 @@ from wireviz.DataClasses import (
 )
 from wireviz.svgembed import embed_svg_images_file
 from wireviz.wv_bom import (
-    HEADER_MPN,
-    HEADER_PN,
-    HEADER_SPN,
     bom_list,
-    component_table_entry,
     generate_bom,
-    get_additional_component_table,
-    pn_info_string,
 )
-from wireviz.wv_colors import get_color_hex, translate_color
 from wireviz.wv_gv_html import (
     apply_dot_tweaks,
     calculate_node_bgcolor,
@@ -39,15 +29,10 @@ from wireviz.wv_gv_html import (
     gv_edge_mate,
     gv_edge_wire,
     gv_node_component,
-    html_line_breaks,
     parse_arrow_str,
-    remove_links,
     set_dot_basics,
 )
 from wireviz.wv_helper import (
-    flatten2d,
-    is_arrow,
-    open_file_read,
     open_file_write,
     tuplelist2tsv,
 )
diff --git a/src/wireviz/wv_gv_html.py b/src/wireviz/wv_gv_html.py
index c001ff8..69ef63d 100644
--- a/src/wireviz/wv_gv_html.py
+++ b/src/wireviz/wv_gv_html.py
@@ -6,13 +6,10 @@ from typing import Any, List, Union
 
 from wireviz import APP_NAME, APP_URL, __version__
 from wireviz.DataClasses import (
-    Arrow,
     ArrowDirection,
     ArrowWeight,
     Cable,
-    Color,
     Component,
-    Connection,
     Connector,
     MateComponent,
     MatePin,
@@ -470,7 +467,7 @@ def image_and_caption_cells(component: Component) -> (Td, Td):
 
 def html_size_attr_dict(image):
     # Return Graphviz HTML attributes to specify minimum or fixed size of a TABLE or TD object
-    from wireviz.DataClasses import Image
+    pass
 
     attr_dict = {}
     if image: