Key Telephone
14
Dec/050
Dec/050
Why the touch tone key pad differ in calculators than in the telephone?
I think the answer is "it just is". The calculator and pushbutton phone were developed independently by different companies in the 1960s. There was no reason to use the same layout, and there are some differences: the phone keypad must have a # and * key; the calculator must have a decimal point, +, -, x and divide keys.
By the way, the keypad in a calculator is not a touch tone one. Touch tone refers to the dialling method used by pushbutton phones.
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![]() Samsung Prostar 816 Plus KSU Hybrid Key Telephone System US $154.99
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![]() Toshiba EKT6520-SD Electronic Key Telephone US $64.99
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![]() ESI EKT - A LCD BUSINESS TELEPHONE ( 12 KEYS ) US $46.00
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![]() Starplus DHS Enhanced Key Telephone US $50.00
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![]() Starplus DHS Executive Key Telephone US $50.00
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![]() Nortel Norstar Key Telephone System 3X8 NNTMH100BTD2 *FREE SHIPPING* US $499.99
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![]() TELRAD KEY BX EXECUTIVE TELEPHONE US $24.99
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![]() SANYO STANDARD KEY TELEPHONE SET # STN2000.BRAND NEW US $5.00
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![]() CONTEL EXECUTONE ECX33 BUTTON EXECUTIVE KEY TELEPHONE PART NO. 2992504 US $49.95
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![]() Panasonic DBS 16 Key Business Telephone US $24.99
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![]() ESI IVX 48 KEY H DFP DIGITAL FEATURE PHONE 48 BUTTON TELEPHONE US $89.95
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![]() ESI IVX 24 KEY DFP DIGITAL FEATURE PHONE 24 BUTTON TELEPHONE US $79.95
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![]() Norstar MX12X0 Key Telephone System W/ NT5B35 Boards US $49.95
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![]() Hytel Digital Key System Telephone Handset HYD-TS20D US $18.89
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![]() VODAVI DIGITAL STARPLUS BASIC 8L KEY TELEPHONE 1411-70 US $30.00
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![]() Western Electric parts 620A key sys.; Vintage Telephone parts US $55.00
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![]() TADIRAN EKT - DKT TELEPHONE PAPER KEY LABELS US $5.00
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![]() VODAVI STARPLUS TRIAD TR9015 24 BUTTON KEY TELEPHONE ^ US $30.00
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![]() Atlas 8 Line Key System Digital Telephone US $.99
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![]() ESI 48 KEY HDFP TELEPHONE LOT OF 50 US $3,500.00
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![]() Atlas 8 Line Key System Telephone US $.99
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![]() ESI 24 KEY TELEPHONE US $95.00
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![]() Executone 2513501 Enore Key Telephone System No Cards US $199.99
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![]() VODAVI Star Plus P/N 3515-71 24 Button Digital Key Office Telephone LOT (4) US $.99
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![]() Toshiba HDSS6560 Electronic Key Telephone NEW!! US $35.00
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![]() Iwatsu ZT-S 616 Key Telephone System US $75.00
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![]() Telrad Digital Key BX Telephone System 4 Cards 76-110-0000 US $399.95
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![]() Toshiba EKT 6020-H 20 Button Electronic Key Telephone P US $79.00
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![]() Toshiba EKT 6025-H Electronic Key Telephone that operat US $75.00
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![]() Panasonic DBS 16 Key Business Telephone VB-42210 US $24.99
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Lady Gaga Telephone Parody (ft Beyonce): Key of Awesome with LYRICS
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