		known writing balls
					Museum	private	unknown
serial number	little number	Model	Owner	Place	29	12	5

??		1. Model in a wooden Box	Museum of Science and Technology	Helsingør/Denmark	1

??		big writing ball / flat carriage	Museum of Science and Technology	Helsingør/Denmark	1
1		big writing ball / flat carriage	German Technical Museum	Berlin/Germany	1
??		big writing ball / flat carriage	Austrian Technical Museum	Vienna/Austria	1

		US-Patentmodel of the big writing ball with a flat carriage	private collector			1
		US-Patentmodel of the portable writing ball without ribbon	private collector			1

??		portable writing ball without ribbon	German Technical Museum	Munich/Germany	1



41
42
43
44
45
46		portable writing ball without ribbon	Museum of Science and Technology	Helsingør/Denmark	1
47
48
49
50
51
52
53
54
55
??		portable writing ball with ribbon	Museum of Science and Technology	Oslo/Norway	1
??		portable writing ball with ribbon	Heinz Nixdorf Museum	Paderborn/Germany	1
56
57
58
59
60
61
62
63
64
65		portable writing ball with ribbon	private collector			1
??		mini writing ball; patent model of the improved writing ball 1878	private collector			1
??		Morse Strip Model 1878	Museum of Science and Technology	Helsingør/Denmark	1
66
67		portable writing ball with ribbon	Historical Museum Bornholm	Bornholm/Denmark	1
68		portable writing ball with ribbon	internet/unknown				1
69		portable writing ball with ribbon	private collector			1
70	9	portable writing ball with ribbon	Museum of Science and Technology	Helsingør/Denmark	1
71
72		portable writing ball with ribbon	Technical Collection Dresden	Dresden/Germany	1
73
74
75		writing ball with a ribbon	The Institute for the Blind in Vienna	Vienna Austria	1
76
77
78
79
80		portable writing ball with ribbon	internet/unknown				1
81		portable writing ball with ribbon	Stockholm Technical Museum	Stockholm/Sweden	1
82
83
84
85
86
87		writing ball with a cylinder	Museum of Science and Technology	Helsingør/Denmark	1
88
??		writing ball with a cylinder	internet/unknown				1
89
90	7	portable writing ball with ribbon	Museum of Science and Technology	Helsingør/Denmark	1
91
92
93	4	portable writing ball with ribbon	Technology Museum of l’Empordà	Figueres/Spain	1
94
95
96
97	5	portable writing ball with ribbon	private collector??			1
98
99
100
101		portable writing ball with ribbon	Birmingham Science Museum	Birmingham/England	1
102
103
104		portable writing ball with ribbon	internet/unknown				1
105
106	10	portable writing ball with ribbon	private collector			1
107	4	portable writing ball with ribbon	Svendborg Museum	Svendborg/Denmark	1
108
109		portable writing ball with ribbon	internet/unknown				1
110
111	7	portable writing ball with ribbon	Museum of Communication	Bern/Switzerland	1
112	8
113	9
114	10
115	1
116	2	portable writing ball with ribbon	Bernard Williams, English collector	England		1
117	3
118	4
119	5	portable writing ball with ribbon	The State Museum for Technology and Work	Mannheim/Germany	1
120
121
122
123
124
125	9	portable writing ball with ribbon	Goethe and Schiller Archive	Weimar/Germany	1
126	10	portable writing ball with ribbon	Culture-Historical Museum Odsherred	Nykøbing/Denmark	1
127
128
129
130
131
132
133
134
135
136
137		portable writing ball with ribbon	private collector			1
138	17	portable writing ball with ribbon / for the blind	School for the Blind	Copenhagen/Denmark	1
139
140		portable writing ball with ribbon	private collector			1
141
142
143
144
145	11	portable writing ball with ribbon	Museum of Science and Technology	Helsingør/Denmark	1
146
147	10	portable writing ball with ribbon	Museum of Science and Technology	Helsingør/Denmark	1
148
149
150
151		portable writing ball with ribbon	private collector			1
152
153
154
155
156
157
158
159
160
161
162	3	portable writing ball with ribbon / for the blind	private collector			1
163
164
165
166
??		portable writing ball with ribbon	Vejle Museum	Vejle/Denmark	1
??		portable writing ball with ribbon	Typewriter Museum	Partschins/Italy	1
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
??		portable writing ball with ribbon	National Museum of American History	USA	1
??