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1927

1929

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1928

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Siemens and Halske Desk Set

Siemens and Halske Desk Set

Siemens

Hartley formulates Hartley's law

PDF: AT&T Annual Report, 1928

AT&T Annual Report, 1928

Photo: Stan Laurel promo pic

Stan Laurel promo pic

PDF: Chicago Telephone 1928 catalog

Chicago Telephone 1928 catalog

Photo: Building for expanding telephone demand, 1928

Building for expanding telephone demand, 1928

PDF: Ericsson 1928 multi-line phones catalog

Ericsson 1928 multi-line phones catalog

PDF: Fuld Der Fernsprecher Im Privathaus brochure

Fuld Der Fernsprecher Im Privathaus brochure

PDF: Kellogg 1928 PBX Switchboards catalog

Kellogg 1928 PBX Switchboards catalog