Vintage RAS Neuray Bicycle hubs from Belgium.
As the Saphir also a replaceable hub, an alternative 'quick release'

Vintage Bicycle Saphir replaceable hubs.
A very alternative form of 'quick release'?
the hubs can be removed while a part of it stays in the frame.

Vintage Alcyon bicycle.
One of the oldest famous French brands.
Also the name of a team from the '10ies until the 50'ies.
Won three Tour de France in the '20ies.

Vintage Merrien.R Bicycle 1950s

Vintage Titan stems,
one adjustable one fixed

Vintage Campagnolo Gran Sport steel seatpost

Vintage Campagnolo 1002, Cambio Paris Roubaix
Model: 1002 – 2° version Paris-Roubaix
In horizontal on shift lever Years: 1950 – 1955
NOS

Vintage Idéale model "52 professionnel saddle" 

Adjustable drop-outs '30ies.
ER probably referring to Etablissements Ravat. A racebike from the stable Ravat/Wonder.
Also Automoto seems to have experimented with adjustable drop-outs in that period.
In the '80ies Gios had its own version.
And also nowadays there are many forms of adjustable drop-outs in various 
disciplines of cycling.
 

Saver from Chalon-sur-Saône.
Many features of Wonder Cycles in St.-Etienne.
Presumably Saver gave his own touch to the Wonder Cycles,
a common practice of all times ... 
Project: lining, other rims and tires, adjusting the gear mechanisme