CA87223A - Porte d'aerage - Google Patents

Porte d'aerage

Info

Publication number
CA87223A
CA87223A CA000087223A CA87223DA CA87223A CA 87223 A CA87223 A CA 87223A CA 000087223 A CA000087223 A CA 000087223A CA 87223D A CA87223D A CA 87223DA CA 87223 A CA87223 A CA 87223A
Authority
CA
Canada
Prior art keywords
trap door
door lifter
lifter
trap
door
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA000087223A
Other languages
English (en)
Inventor
Frank Fountain
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of CA87223A publication Critical patent/CA87223A/fr
Expired legal-status Critical Current

Links

CA000087223A 1904-04-20 1904-04-20 Porte d'aerage Expired CA87223A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA87223T 1904-04-20

Publications (1)

Publication Number Publication Date
CA87223A true CA87223A (fr) 1904-05-17

Family

ID=45203758

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000087223A Expired CA87223A (fr) 1904-04-20 1904-04-20 Porte d'aerage

Country Status (1)

Country Link
CA (1) CA87223A (fr)

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