107:
35:
137:
132:
83:
59:
142:
126:
111:
39:
63:
87:
20:
This category has the following 4 subcategories, out of 4 total.
8:
108:Engineering companies of the United States
36:Aircraft manufacturers of North America
138:Technology companies of North America
7:
133:Engineering companies by continent
104:
80:
56:
32:
22:
14:
84:Engineering companies of Mexico
1:
60:Engineering companies of Cuba
159:
143:Companies of North America
150:
113:
106:
89:
82:
65:
58:
41:
34:
158:
157:
153:
152:
151:
149:
148:
147:
123:
122:
121:
120:
119:
118:
115:
114:
103:
94:
91:
90:
79:
70:
67:
66:
55:
46:
43:
42:
31:
12:
11:
5:
156:
154:
146:
145:
140:
135:
125:
124:
117:
116:
102:
101:
98:
95:
93:
92:
78:
77:
74:
71:
69:
68:
54:
53:
50:
47:
45:
44:
30:
29:
26:
24:
23:
18:
15:
13:
10:
9:
6:
4:
3:
2:
155:
144:
141:
139:
136:
134:
131:
130:
128:
112:(11 C, 159 P)
109:
105:
100:
99:
96:
85:
81:
76:
75:
72:
61:
57:
52:
51:
48:
37:
33:
28:
27:
25:
21:
17:Subcategories
16:
19:
127:Categories
88:(1 C, 1 P)
64:(1 C)
40:(3 C)
129::
110:
86:
62:
38:
97:U
73:M
49:C
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