@Hyperlynx: No problem.
First Siemens is Siemens and Siteco is a name from Siemens for lighting since 1997. At the beginning the lanterns got the Siemens sign, since 1997 the Siteco sign. Siteco became later independent but now in 2011 it was bought back by Siemens under its brand "Osram". The code ALH/ALQ was used just by Siemens within 1967, after 1967 they got the 5NA/5LA names (but they kept the ALH/ALQ still some years with the 5NA code. Since 1973 the ALH/ALQ stamp was removed completly and 5NA/5LA was left alone. (The 5NA/5LA/5LC... names still exist under Siteco). BTW the Siemens ALH 52 is just the spanwire version which is pretty rare, there exist also like in your gallery the ALH50 which is also a spanwire version. The ALH 51 is the normal side post Hackebeilchen. Yeah the names are complex so many lanterns have more than one name.
Siemens made special lanterns like MRL BW for other countries which had not existed in Germany but the firms was been normaly bought by Siemens and the design of the MRLBW is very german
They even produced Eclatec lanterns under Siemens name in Saudi Arabia for example.
However to your list:
21 AEG Flache Ansetzleuchte with Silikatglas
22 Hellux 181
23 I'm not sure about this one but I guess it's from Vulkan
24 maybe Se'lux
25 could be special Bega München lanterns
26 no idea
27 background lantern is a Siemens ALQ 24X
28 i will later edit the info
29 AEG Flache Seilleuchte
30 Rademacher 395111 - 395212 Gleisfeld-Leuchte
31 Trilux 877
32 Hellux 448
33 Trilux 98XX
34 Rademacher Gleisfeldleuchte
35 Philips SRP as Sander said. They was been popular here as one of the less SOX lanterns
36 Siemens 5NA 377
37 Hess Saurius
38 Probably Leiziger Leuchten Antje I
39 I thought AE Austria but I'm not sure
40 RSL (GDR)
41 Bulgarian lantern
42 LBL Topf (GDR)