That site show the Avis Flugzeugwerke und Autowerke GmbH aircraft,it included,
BS.I,BS.II,BS.III,BGV.I & BV.I,there was also BS.IV project.
It does. The 'B' in the AVIS aircraft designs came from their designer,
Dipl Ing Julius von Berg (formerly of Aviatik). The 'BS' series were intended as AVIS flying school trainers (so, 'BS' was probably for 'Berg Schulflugzeug' or similar). I suspect that 'BV' was for 'Berg Verkehr' (Berg Transport) and 'BGV' for 'Berg Großer Verkehr' (Berg Heavy Transport).
The corporate history goes something like this:
1922-1924: Technische Werkstätten Ges.mbH in Wien made small cars and dabbled in aircraft in Vienna
- 1922(?): AVIS repair facilities opened in Vienna- Währing, Canongasse 12
1924-1931: Became AVIS Flugzeug- und Autowerke Ges.mbH; [1] HQ in Vienna (Freyung 3)
- 1924: Land acquired in Brunn am Gebirge for AVIS factory; aerodrome was at Aspern
-- AVIS flight school established while offering aerial photography and sightseeing junkets
-- Original AVIS aircraft design begun under
Dipl Ing Julius von Berg
- 1928 : Aviation activities at AVIS Flugzeug- und Autowerke Ges.mbH come to an end
- 1931 : AVIS Flugzeug- und Autowerke Ges.mbH assets completely liquidated
AVIS Aircraft Types and Designations went as follows:
AVIS BS I - 1924 tandem 2-seat parasol-wing trainer; x 1
- AVIS BS I : Strut-braced, semi-cantilever parasol wing
- AVIS BS I : 1 x 100 hp (??) 6-cyl. inline; span 10.40 m
-- Constr. ply-covered wood wings; steel-tube fuselage
- AVIS BS I : Civil reg. A-10; offered export military use
-- BS I crashed 30 July 1924 on demonstration in Sofia*
-- * Bulgarian AF pilot attempted aerobatic manoeuvres
AVIS BS II - 1924 tandem 2-seat parasol-wing trainer; x 1
- AVIS BS II : Evol. of BS I w/ continuous cockpit opening
- AVIS BS II : 1 x 100 hp (??) 6-cyl. inline; span 10.40 m
-- Constr. as BS I; Fokker-style wood/welded steel-tube
- AVIS BS II : Civil reg. A-16; to Schmidgruber & Schmid
AVIS BS III - 1925 tandem 2-seat parasol-wing trainer; x 1
- AVIS BS III: As per BS II; distinguished by wheel covers
- AVIS BS III: 1 x 100 hp (??) 6-cyl. inline; span 10.40 m
- AVIS BS III: Austria civilian registration was A-15
-- Demonstrated to Austrian military; Graz Thalerhof, 1930
AVIS BS IV - 1925 tandem 2-seat parasol-wing trainer; x 1
- AVIS BS IV: As per BS II; distinguished by wheel covers
- AVIS BS IV: 1 x 80 hp Siemens-Halske Sh 5; span 10.40 m
- AVIS BS IV: Apparently, no Austrian civilian registration
-- Going by Flight drawings; BS IV had thinner profile wings
--
https://aviadejavu.ru/Images6/FT/FT1925/04/227-1.jpg
- AVIS BS IV: Fate unconfimed; reported crashed in 1925
AVIS BGV I - 1924 trimotor passenger carrier biplane; x 1
- AVIS BGV I: 2+6; cabin under wings; cockpit set far aft
- AVIS BGV I: 1 x 235 hp + 2 x 100 hp;* span 19.00 m
- AVIS BGV I: Constr. resembles both BS & BV I types
-- A-11; intended as operational basis for an AVIS airline
-- * Some sources claim that 235 hp was an AVIS design
-- * Some sources list Mercedes 100 hp; others 120 hp
AVIS BV I - 1925 cabin passenger parasol monoplane; x 1
- AVIS BV I: 1+3; cabin under wings; cockpit set far aft
- AVIS BV I: 1 x 100 hp (??) 6-cyl. inline; span 14.20 m
- AVIS BV I: Conceptually, airliner deriv. of the BS series
-- Very deep central fuselage to accommodate the 3 x pax
- AVIS BV I : A-12; fate unconf.; reported crashed in 1925