Digitizer cursor for computer drafting

Details Digitizer cursor for computer drafting Digitizer cursor for computer drafting

1979-08-24

1981-10-13

Spangler, Robert C.

Printing and office machinery

Typewriter or calculator

Calculator

D10 63, D1801

Patent

active

D02612747

REFERENCES:
patent: D197608 (1964-03-01), Seaver
patent: D211473 (1968-06-01), Dykmans et al.
patent: D220218 (1971-03-01), Jacobs et al.
patent: D234603 (1975-03-01), Snow et al.
patent: D248995 (1978-08-01), Hazama et al.
patent: 3553681 (1971-01-01), Cone
patent: 4069588 (1978-01-01), Hoppe
patent: 4158229 (1979-06-01), Woo, Jr. et al.
patent: 4184261 (1980-01-01), Buerner

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