"Wall cases with writing desk"
(Click at the pictures to see a real version of the phone).

Picture 441, click for a real version, Museum für Post und Telekommunikation
 1898

Model M.98p (S&H),
first type of walltelephone with desk, 1898
- case of walnut
- 1 tin telephone with ringmagnet
- carbon-bag microphone by
   Siemens & Halske
- induction coil
- magneto calling
- polarized ringer
- Lightning arrester
- local battery working with DC-
  busy test
1899/1900

Model M.99p/M.00p, 1899/1900
- case of walnut
- 1 telephone M.93 or telephone
   with ringmagnet M.00
- carbon-granule microphone
   (Mix & Genest)
- induction coil
- magneto calling M.98
- polarized ringer M.99
- Lightning arrester (only M.99p)
- local battery working with DC-
  busy test
Picture 442, click for a real version, private collection
Picture 443, Museum für Post und Telekommunikation
 1903

Model Stf.03,
first type of walltelephone with microphone adjustable for high, 1903
- case of walnut
- 1 telephone with ringmagnet M.00
- carbon-granule microphone
- induction coil
- magneto calling M.98
- polarized ringer M.03
- local battery working with DC-
  busy test
1904

Model Stf.04, 1904
- case of walnut
- 1 telephone with ringmagnet M.03
- carbon-granule microphone
- induction coil
- magneto calling M.04
- polarized ringer M.03
- local battery working with
  automatic clearing
Picture 444, click for a real version, private collection
Picture 445, no real version available
 1904

Model ZB.04,
common wall case with desk top as an CB-phone, 1904
- case of walnut
- 1 telephone with ringmagnet M.03
- carbon-granule microphone,
   adjustable for height
- induction coil
- CB calling
- polarized ringer
- capacitor
Batterycase

All these telephones needed local
batteries for the microphone current
(2 cells) (except for the CB-phone).
These batteries were housed in little wall cupboards.
Picture 446