J. Van Waveren, Haarlem

3

F. Ernecke, Berlin

2

J.A. Schoonbeek, Haarlem

2

Ruhmkorff, Parijs

2

E. Ducretet & L. Lejeune, Parijs

1

E. Ducretet et Lejeune, Paris

1

E. Ducretet, Parijs

1

E. Ducretet, Paris

1

F. Ernecke, Berlijn

1

F.W. Funckler, Haarlem

1

H.G. Brevete S.G.D.G

1

J. Duboscq, Parijs

1

J. Solomon, London

1

J. van Waveren

1

Jan Paauw, Leiden

1

John Cuthbertson probably

1

probably Logeman

1

Probably supplied by Worsdel

1

Siemens & Halske

1

Steitz, Adam

1

V.S.M. van der Willigen, Deventer

1

W.M. Logeman, Haarlem

1

Watkins & Hill, London

1

Copper

65

brass

44

Glass

25

Mahogany

21

Wood

14

Iron

12

zinc

8

lead

6

Tinplate

4

Paper

3

steel

3

copper or silver

2

ivory

2

rubber

2

a.o

1

Boxwood

1

carbon

1

copper et

1

copper etc

1

copper?

1

Cork

1

Ebonite

1

leather

1

limewood

1

metals

1

'new silver'

1

nickel

1

oak

1

oakboard

1

Pinewood

1

tin

1

zinc?

1

demonstratietoestel

2

demonstratietoestel warmtegeleiding

1

model snelkookpan

1

stoomwagen

1